1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
31 #include "coretypes.h"
35 #include "tree-inline.h"
52 #include "langhooks.h"
53 #include "tree-mudflap.h"
54 #include "tree-gimple.h"
55 #include "diagnostic.h"
56 #include "tree-dump.h"
61 #include "langhooks-def.h"
63 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
65 { NORMAL, /* Ordinary declaration */
66 FUNCDEF, /* Function definition */
67 PARM, /* Declaration of parm before function body */
68 FIELD, /* Declaration inside struct or union */
69 TYPENAME}; /* Typename (inside cast or sizeof) */
72 /* Nonzero if we have seen an invalid cross reference
73 to a struct, union, or enum, but not yet printed the message. */
74 tree pending_invalid_xref;
76 /* File and line to appear in the eventual error message. */
77 location_t pending_invalid_xref_location;
79 /* True means we've initialized exception handling. */
80 bool c_eh_initialized_p;
82 /* While defining an enum type, this is 1 plus the last enumerator
83 constant value. Note that will do not have to save this or `enum_overflow'
84 around nested function definition since such a definition could only
85 occur in an enum value expression and we don't use these variables in
88 static tree enum_next_value;
90 /* Nonzero means that there was overflow computing enum_next_value. */
92 static int enum_overflow;
94 /* The file and line that the prototype came from if this is an
95 old-style definition; used for diagnostics in
96 store_parm_decls_oldstyle. */
98 static location_t current_function_prototype_locus;
100 /* The argument information structure for the function currently being
103 static struct c_arg_info *current_function_arg_info;
105 /* The obstack on which parser and related data structures, which are
106 not live beyond their top-level declaration or definition, are
108 struct obstack parser_obstack;
110 /* The current statement tree. */
112 static GTY(()) struct stmt_tree_s c_stmt_tree;
114 /* State saving variables. */
118 /* Linked list of TRANSLATION_UNIT_DECLS for the translation units
119 included in this invocation. Note that the current translation
120 unit is not included in this list. */
122 static GTY(()) tree all_translation_units;
124 /* A list of decls to be made automatically visible in each file scope. */
125 static GTY(()) tree visible_builtins;
127 /* Set to 0 at beginning of a function definition, set to 1 if
128 a return statement that specifies a return value is seen. */
130 int current_function_returns_value;
132 /* Set to 0 at beginning of a function definition, set to 1 if
133 a return statement with no argument is seen. */
135 int current_function_returns_null;
137 /* Set to 0 at beginning of a function definition, set to 1 if
138 a call to a noreturn function is seen. */
140 int current_function_returns_abnormally;
142 /* Set to nonzero by `grokdeclarator' for a function
143 whose return type is defaulted, if warnings for this are desired. */
145 static int warn_about_return_type;
147 /* Nonzero when starting a function declared `extern inline'. */
149 static int current_extern_inline;
151 /* True means global_bindings_p should return false even if the scope stack
152 says we are in file scope. */
153 bool c_override_global_bindings_to_false;
156 /* Each c_binding structure describes one binding of an identifier to
157 a decl. All the decls in a scope - irrespective of namespace - are
158 chained together by the ->prev field, which (as the name implies)
159 runs in reverse order. All the decls in a given namespace bound to
160 a given identifier are chained by the ->shadowed field, which runs
161 from inner to outer scopes.
163 The ->decl field usually points to a DECL node, but there are two
164 exceptions. In the namespace of type tags, the bound entity is a
165 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
166 identifier is encountered, it is bound to error_mark_node to
167 suppress further errors about that identifier in the current
170 The ->type field stores the type of the declaration in this scope;
171 if NULL, the type is the type of the ->decl field. This is only of
172 relevance for objects with external or internal linkage which may
173 be redeclared in inner scopes, forming composite types that only
174 persist for the duration of those scopes. In the external scope,
175 this stores the composite of all the types declared for this
176 object, visible or not. The ->inner_comp field (used only at file
177 scope) stores whether an incomplete array type at file scope was
178 completed at an inner scope to an array size other than 1.
180 The depth field is copied from the scope structure that holds this
181 decl. It is used to preserve the proper ordering of the ->shadowed
182 field (see bind()) and also for a handful of special-case checks.
183 Finally, the invisible bit is true for a decl which should be
184 ignored for purposes of normal name lookup, and the nested bit is
185 true for a decl that's been bound a second time in an inner scope;
186 in all such cases, the binding in the outer scope will have its
187 invisible bit true. */
189 struct c_binding GTY((chain_next ("%h.prev")))
191 tree decl; /* the decl bound */
192 tree type; /* the type in this scope */
193 tree id; /* the identifier it's bound to */
194 struct c_binding *prev; /* the previous decl in this scope */
195 struct c_binding *shadowed; /* the innermost decl shadowed by this one */
196 unsigned int depth : 28; /* depth of this scope */
197 BOOL_BITFIELD invisible : 1; /* normal lookup should ignore this binding */
198 BOOL_BITFIELD nested : 1; /* do not set DECL_CONTEXT when popping */
199 BOOL_BITFIELD inner_comp : 1; /* incomplete array completed in inner scope */
202 #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
203 #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
204 #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
205 #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
207 #define I_SYMBOL_BINDING(node) \
208 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->symbol_binding)
209 #define I_SYMBOL_DECL(node) \
210 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
212 #define I_TAG_BINDING(node) \
213 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->tag_binding)
214 #define I_TAG_DECL(node) \
215 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
217 #define I_LABEL_BINDING(node) \
218 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->label_binding)
219 #define I_LABEL_DECL(node) \
220 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
222 /* Each C symbol points to three linked lists of c_binding structures.
223 These describe the values of the identifier in the three different
224 namespaces defined by the language. */
226 struct lang_identifier GTY(())
228 struct c_common_identifier common_id;
229 struct c_binding *symbol_binding; /* vars, funcs, constants, typedefs */
230 struct c_binding *tag_binding; /* struct/union/enum tags */
231 struct c_binding *label_binding; /* labels */
234 /* Validate c-lang.c's assumptions. */
235 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
236 [(sizeof(struct lang_identifier) == C_SIZEOF_STRUCT_LANG_IDENTIFIER) ? 1 : -1];
238 /* The resulting tree type. */
241 GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
242 chain_next ("TREE_CODE (&%h.generic) == INTEGER_TYPE ? (union lang_tree_node *) TYPE_NEXT_VARIANT (&%h.generic) : (union lang_tree_node *) TREE_CHAIN (&%h.generic)")))
244 union tree_node GTY ((tag ("0"),
245 desc ("tree_node_structure (&%h)")))
247 struct lang_identifier GTY ((tag ("1"))) identifier;
250 /* Each c_scope structure describes the complete contents of one
251 scope. Four scopes are distinguished specially: the innermost or
252 current scope, the innermost function scope, the file scope (always
253 the second to outermost) and the outermost or external scope.
255 Most declarations are recorded in the current scope.
257 All normal label declarations are recorded in the innermost
258 function scope, as are bindings of undeclared identifiers to
259 error_mark_node. (GCC permits nested functions as an extension,
260 hence the 'innermost' qualifier.) Explicitly declared labels
261 (using the __label__ extension) appear in the current scope.
263 Being in the file scope (current_scope == file_scope) causes
264 special behavior in several places below. Also, under some
265 conditions the Objective-C front end records declarations in the
266 file scope even though that isn't the current scope.
268 All declarations with external linkage are recorded in the external
269 scope, even if they aren't visible there; this models the fact that
270 such declarations are visible to the entire program, and (with a
271 bit of cleverness, see pushdecl) allows diagnosis of some violations
272 of C99 6.2.2p7 and 6.2.7p2:
274 If, within the same translation unit, the same identifier appears
275 with both internal and external linkage, the behavior is
278 All declarations that refer to the same object or function shall
279 have compatible type; otherwise, the behavior is undefined.
281 Initially only the built-in declarations, which describe compiler
282 intrinsic functions plus a subset of the standard library, are in
285 The order of the blocks list matters, and it is frequently appended
286 to. To avoid having to walk all the way to the end of the list on
287 each insertion, or reverse the list later, we maintain a pointer to
288 the last list entry. (FIXME: It should be feasible to use a reversed
291 The bindings list is strictly in reverse order of declarations;
292 pop_scope relies on this. */
295 struct c_scope GTY((chain_next ("%h.outer")))
297 /* The scope containing this one. */
298 struct c_scope *outer;
300 /* The next outermost function scope. */
301 struct c_scope *outer_function;
303 /* All bindings in this scope. */
304 struct c_binding *bindings;
306 /* For each scope (except the global one), a chain of BLOCK nodes
307 for all the scopes that were entered and exited one level down. */
311 /* The depth of this scope. Used to keep the ->shadowed chain of
312 bindings sorted innermost to outermost. */
313 unsigned int depth : 28;
315 /* True if we are currently filling this scope with parameter
317 BOOL_BITFIELD parm_flag : 1;
319 /* True if we already complained about forward parameter decls
320 in this scope. This prevents double warnings on
321 foo (int a; int b; ...) */
322 BOOL_BITFIELD warned_forward_parm_decls : 1;
324 /* True if this is the outermost block scope of a function body.
325 This scope contains the parameters, the local variables declared
326 in the outermost block, and all the labels (except those in
327 nested functions, or declared at block scope with __label__). */
328 BOOL_BITFIELD function_body : 1;
330 /* True means make a BLOCK for this scope no matter what. */
331 BOOL_BITFIELD keep : 1;
334 /* The scope currently in effect. */
336 static GTY(()) struct c_scope *current_scope;
338 /* The innermost function scope. Ordinary (not explicitly declared)
339 labels, bindings to error_mark_node, and the lazily-created
340 bindings of __func__ and its friends get this scope. */
342 static GTY(()) struct c_scope *current_function_scope;
344 /* The C file scope. This is reset for each input translation unit. */
346 static GTY(()) struct c_scope *file_scope;
348 /* The outermost scope. This is used for all declarations with
349 external linkage, and only these, hence the name. */
351 static GTY(()) struct c_scope *external_scope;
353 /* A chain of c_scope structures awaiting reuse. */
355 static GTY((deletable)) struct c_scope *scope_freelist;
357 /* A chain of c_binding structures awaiting reuse. */
359 static GTY((deletable)) struct c_binding *binding_freelist;
361 /* Append VAR to LIST in scope SCOPE. */
362 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
363 struct c_scope *s_ = (scope); \
365 if (s_->list##_last) \
366 TREE_CHAIN (s_->list##_last) = d_; \
369 s_->list##_last = d_; \
372 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
373 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
374 struct c_scope *t_ = (tscope); \
375 struct c_scope *f_ = (fscope); \
377 TREE_CHAIN (t_->to##_last) = f_->from; \
380 t_->to##_last = f_->from##_last; \
383 /* True means unconditionally make a BLOCK for the next scope pushed. */
385 static bool keep_next_level_flag;
387 /* True means the next call to push_scope will be the outermost scope
388 of a function body, so do not push a new scope, merely cease
389 expecting parameter decls. */
391 static bool next_is_function_body;
393 /* Functions called automatically at the beginning and end of execution. */
395 static GTY(()) tree static_ctors;
396 static GTY(()) tree static_dtors;
398 /* Forward declarations. */
399 static tree lookup_name_in_scope (tree, struct c_scope *);
400 static tree c_make_fname_decl (tree, int);
401 static tree grokdeclarator (const struct c_declarator *,
402 struct c_declspecs *,
403 enum decl_context, bool, tree *);
404 static tree grokparms (struct c_arg_info *, bool);
405 static void layout_array_type (tree);
407 /* States indicating how grokdeclarator() should handle declspecs marked
408 with __attribute__((deprecated)). An object declared as
409 __attribute__((deprecated)) suppresses warnings of uses of other
412 enum deprecated_states {
417 static enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
420 c_print_identifier (FILE *file, tree node, int indent)
422 print_node (file, "symbol", I_SYMBOL_DECL (node), indent + 4);
423 print_node (file, "tag", I_TAG_DECL (node), indent + 4);
424 print_node (file, "label", I_LABEL_DECL (node), indent + 4);
425 if (C_IS_RESERVED_WORD (node))
427 tree rid = ridpointers[C_RID_CODE (node)];
428 indent_to (file, indent + 4);
429 fprintf (file, "rid " HOST_PTR_PRINTF " \"%s\"",
430 (void *) rid, IDENTIFIER_POINTER (rid));
434 /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL,
435 which may be any of several kinds of DECL or TYPE or error_mark_node,
436 in the scope SCOPE. */
438 bind (tree name, tree decl, struct c_scope *scope, bool invisible, bool nested)
440 struct c_binding *b, **here;
442 if (binding_freelist)
444 b = binding_freelist;
445 binding_freelist = b->prev;
448 b = GGC_NEW (struct c_binding);
453 b->depth = scope->depth;
454 b->invisible = invisible;
460 b->prev = scope->bindings;
466 switch (TREE_CODE (decl))
468 case LABEL_DECL: here = &I_LABEL_BINDING (name); break;
471 case RECORD_TYPE: here = &I_TAG_BINDING (name); break;
477 case ERROR_MARK: here = &I_SYMBOL_BINDING (name); break;
483 /* Locate the appropriate place in the chain of shadowed decls
484 to insert this binding. Normally, scope == current_scope and
485 this does nothing. */
486 while (*here && (*here)->depth > scope->depth)
487 here = &(*here)->shadowed;
493 /* Clear the binding structure B, stick it on the binding_freelist,
494 and return the former value of b->prev. This is used by pop_scope
495 and get_parm_info to iterate destructively over all the bindings
496 from a given scope. */
497 static struct c_binding *
498 free_binding_and_advance (struct c_binding *b)
500 struct c_binding *prev = b->prev;
502 memset (b, 0, sizeof (struct c_binding));
503 b->prev = binding_freelist;
504 binding_freelist = b;
510 /* Hook called at end of compilation to assume 1 elt
511 for a file-scope tentative array defn that wasn't complete before. */
514 c_finish_incomplete_decl (tree decl)
516 if (TREE_CODE (decl) == VAR_DECL)
518 tree type = TREE_TYPE (decl);
519 if (type != error_mark_node
520 && TREE_CODE (type) == ARRAY_TYPE
521 && !DECL_EXTERNAL (decl)
522 && TYPE_DOMAIN (type) == 0)
524 warning ("%Jarray %qD assumed to have one element", decl, decl);
526 complete_array_type (type, NULL_TREE, 1);
528 layout_decl (decl, 0);
533 /* The Objective-C front-end often needs to determine the current scope. */
536 objc_get_current_scope (void)
538 return current_scope;
541 /* The following function is used only by Objective-C. It needs to live here
542 because it accesses the innards of c_scope. */
545 objc_mark_locals_volatile (void *enclosing_blk)
547 struct c_scope *scope;
550 for (scope = current_scope;
551 scope && scope != enclosing_blk;
552 scope = scope->outer)
554 for (b = scope->bindings; b; b = b->prev)
556 if (TREE_CODE (b->decl) == VAR_DECL
557 || TREE_CODE (b->decl) == PARM_DECL)
559 C_DECL_REGISTER (b->decl) = 0;
560 DECL_REGISTER (b->decl) = 0;
561 TREE_THIS_VOLATILE (b->decl) = 1;
565 /* Do not climb up past the current function. */
566 if (scope->function_body)
571 /* Nonzero if we are currently in file scope. */
574 global_bindings_p (void)
576 return current_scope == file_scope && !c_override_global_bindings_to_false;
580 keep_next_level (void)
582 keep_next_level_flag = true;
585 /* Identify this scope as currently being filled with parameters. */
588 declare_parm_level (void)
590 current_scope->parm_flag = true;
596 if (next_is_function_body)
598 /* This is the transition from the parameters to the top level
599 of the function body. These are the same scope
600 (C99 6.2.1p4,6) so we do not push another scope structure.
601 next_is_function_body is set only by store_parm_decls, which
602 in turn is called when and only when we are about to
603 encounter the opening curly brace for the function body.
605 The outermost block of a function always gets a BLOCK node,
606 because the debugging output routines expect that each
607 function has at least one BLOCK. */
608 current_scope->parm_flag = false;
609 current_scope->function_body = true;
610 current_scope->keep = true;
611 current_scope->outer_function = current_function_scope;
612 current_function_scope = current_scope;
614 keep_next_level_flag = false;
615 next_is_function_body = false;
619 struct c_scope *scope;
622 scope = scope_freelist;
623 scope_freelist = scope->outer;
626 scope = GGC_CNEW (struct c_scope);
628 scope->keep = keep_next_level_flag;
629 scope->outer = current_scope;
630 scope->depth = current_scope ? (current_scope->depth + 1) : 0;
632 /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
634 if (current_scope && scope->depth == 0)
637 sorry ("GCC supports only %u nested scopes", scope->depth);
640 current_scope = scope;
641 keep_next_level_flag = false;
645 /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */
648 set_type_context (tree type, tree context)
650 for (type = TYPE_MAIN_VARIANT (type); type;
651 type = TYPE_NEXT_VARIANT (type))
652 TYPE_CONTEXT (type) = context;
655 /* Exit a scope. Restore the state of the identifier-decl mappings
656 that were in effect when this scope was entered. Return a BLOCK
657 node containing all the DECLs in this scope that are of interest
658 to debug info generation. */
663 struct c_scope *scope = current_scope;
664 tree block, context, p;
667 bool functionbody = scope->function_body;
668 bool keep = functionbody || scope->keep || scope->bindings;
670 /* If appropriate, create a BLOCK to record the decls for the life
675 block = make_node (BLOCK);
676 BLOCK_SUBBLOCKS (block) = scope->blocks;
677 TREE_USED (block) = 1;
679 /* In each subblock, record that this is its superior. */
680 for (p = scope->blocks; p; p = TREE_CHAIN (p))
681 BLOCK_SUPERCONTEXT (p) = block;
683 BLOCK_VARS (block) = 0;
686 /* The TYPE_CONTEXTs for all of the tagged types belonging to this
687 scope must be set so that they point to the appropriate
688 construct, i.e. either to the current FUNCTION_DECL node, or
689 else to the BLOCK node we just constructed.
691 Note that for tagged types whose scope is just the formal
692 parameter list for some function type specification, we can't
693 properly set their TYPE_CONTEXTs here, because we don't have a
694 pointer to the appropriate FUNCTION_TYPE node readily available
695 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
696 type nodes get set in `grokdeclarator' as soon as we have created
697 the FUNCTION_TYPE node which will represent the "scope" for these
698 "parameter list local" tagged types. */
699 if (scope->function_body)
700 context = current_function_decl;
701 else if (scope == file_scope)
703 tree file_decl = build_decl (TRANSLATION_UNIT_DECL, 0, 0);
704 TREE_CHAIN (file_decl) = all_translation_units;
705 all_translation_units = file_decl;
711 /* Clear all bindings in this scope. */
712 for (b = scope->bindings; b; b = free_binding_and_advance (b))
715 switch (TREE_CODE (p))
718 /* Warnings for unused labels, errors for undefined labels. */
719 if (TREE_USED (p) && !DECL_INITIAL (p))
721 error ("%Jlabel %qD used but not defined", p, p);
722 DECL_INITIAL (p) = error_mark_node;
724 else if (!TREE_USED (p) && warn_unused_label)
726 if (DECL_INITIAL (p))
727 warning ("%Jlabel %qD defined but not used", p, p);
729 warning ("%Jlabel %qD declared but not defined", p, p);
731 /* Labels go in BLOCK_VARS. */
732 TREE_CHAIN (p) = BLOCK_VARS (block);
733 BLOCK_VARS (block) = p;
734 gcc_assert (I_LABEL_BINDING (b->id) == b);
735 I_LABEL_BINDING (b->id) = b->shadowed;
741 set_type_context (p, context);
743 /* Types may not have tag-names, in which case the type
744 appears in the bindings list with b->id NULL. */
747 gcc_assert (I_TAG_BINDING (b->id) == b);
748 I_TAG_BINDING (b->id) = b->shadowed;
753 /* Propagate TREE_ADDRESSABLE from nested functions to their
754 containing functions. */
755 if (!TREE_ASM_WRITTEN (p)
756 && DECL_INITIAL (p) != 0
757 && TREE_ADDRESSABLE (p)
758 && DECL_ABSTRACT_ORIGIN (p) != 0
759 && DECL_ABSTRACT_ORIGIN (p) != p)
760 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p)) = 1;
764 /* Warnings for unused variables. */
765 if (warn_unused_variable
767 && !DECL_IN_SYSTEM_HEADER (p)
769 && !DECL_ARTIFICIAL (p)
770 && scope != file_scope
771 && scope != external_scope)
772 warning ("%Junused variable %qD", p, p);
776 error ("%Jtype of array %qD completed incompatibly with"
777 " implicit initialization", p, p);
784 /* All of these go in BLOCK_VARS, but only if this is the
785 binding in the home scope. */
788 TREE_CHAIN (p) = BLOCK_VARS (block);
789 BLOCK_VARS (block) = p;
791 /* If this is the file scope, and we are processing more
792 than one translation unit in this compilation, set
793 DECL_CONTEXT of each decl to the TRANSLATION_UNIT_DECL.
794 This makes same_translation_unit_p work, and causes
795 static declarations to be given disambiguating suffixes. */
796 if (scope == file_scope && num_in_fnames > 1)
798 DECL_CONTEXT (p) = context;
799 if (TREE_CODE (p) == TYPE_DECL)
800 set_type_context (TREE_TYPE (p), context);
804 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
805 already been put there by store_parm_decls. Unused-
806 parameter warnings are handled by function.c.
807 error_mark_node obviously does not go in BLOCK_VARS and
808 does not get unused-variable warnings. */
811 /* It is possible for a decl not to have a name. We get
812 here with b->id NULL in this case. */
815 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
816 I_SYMBOL_BINDING (b->id) = b->shadowed;
817 if (b->shadowed && b->shadowed->type)
818 TREE_TYPE (b->shadowed->decl) = b->shadowed->type;
828 /* Dispose of the block that we just made inside some higher level. */
829 if ((scope->function_body || scope == file_scope) && context)
831 DECL_INITIAL (context) = block;
832 BLOCK_SUPERCONTEXT (block) = context;
834 else if (scope->outer)
837 SCOPE_LIST_APPEND (scope->outer, blocks, block);
838 /* If we did not make a block for the scope just exited, any
839 blocks made for inner scopes must be carried forward so they
840 will later become subblocks of something else. */
841 else if (scope->blocks)
842 SCOPE_LIST_CONCAT (scope->outer, blocks, scope, blocks);
845 /* Pop the current scope, and free the structure for reuse. */
846 current_scope = scope->outer;
847 if (scope->function_body)
848 current_function_scope = scope->outer_function;
850 memset (scope, 0, sizeof (struct c_scope));
851 scope->outer = scope_freelist;
852 scope_freelist = scope;
858 push_file_scope (void)
866 file_scope = current_scope;
868 start_fname_decls ();
870 for (decl = visible_builtins; decl; decl = TREE_CHAIN (decl))
871 bind (DECL_NAME (decl), decl, file_scope,
872 /*invisible=*/false, /*nested=*/true);
876 pop_file_scope (void)
878 /* In case there were missing closebraces, get us back to the global
880 while (current_scope != file_scope)
883 /* __FUNCTION__ is defined at file scope (""). This
884 call may not be necessary as my tests indicate it
885 still works without it. */
886 finish_fname_decls ();
888 /* This is the point to write out a PCH if we're doing that.
889 In that case we do not want to do anything else. */
892 c_common_write_pch ();
896 /* Pop off the file scope and close this translation unit. */
899 cgraph_finalize_compilation_unit ();
902 /* Insert BLOCK at the end of the list of subblocks of the current
903 scope. This is used when a BIND_EXPR is expanded, to handle the
904 BLOCK node inside the BIND_EXPR. */
907 insert_block (tree block)
909 TREE_USED (block) = 1;
910 SCOPE_LIST_APPEND (current_scope, blocks, block);
913 /* Push a definition or a declaration of struct, union or enum tag "name".
914 "type" should be the type node.
915 We assume that the tag "name" is not already defined.
917 Note that the definition may really be just a forward reference.
918 In that case, the TYPE_SIZE will be zero. */
921 pushtag (tree name, tree type)
923 /* Record the identifier as the type's name if it has none. */
924 if (name && !TYPE_NAME (type))
925 TYPE_NAME (type) = name;
926 bind (name, type, current_scope, /*invisible=*/false, /*nested=*/false);
928 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
929 tagged type we just added to the current scope. This fake
930 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
931 to output a representation of a tagged type, and it also gives
932 us a convenient place to record the "scope start" address for the
935 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
937 /* An approximation for now, so we can tell this is a function-scope tag.
938 This will be updated in pop_scope. */
939 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
942 /* Subroutine of compare_decls. Allow harmless mismatches in return
943 and argument types provided that the type modes match. This function
944 return a unified type given a suitable match, and 0 otherwise. */
947 match_builtin_function_types (tree newtype, tree oldtype)
949 tree newrettype, oldrettype;
950 tree newargs, oldargs;
951 tree trytype, tryargs;
953 /* Accept the return type of the new declaration if same modes. */
954 oldrettype = TREE_TYPE (oldtype);
955 newrettype = TREE_TYPE (newtype);
957 if (TYPE_MODE (oldrettype) != TYPE_MODE (newrettype))
960 oldargs = TYPE_ARG_TYPES (oldtype);
961 newargs = TYPE_ARG_TYPES (newtype);
964 while (oldargs || newargs)
968 || !TREE_VALUE (oldargs)
969 || !TREE_VALUE (newargs)
970 || TYPE_MODE (TREE_VALUE (oldargs))
971 != TYPE_MODE (TREE_VALUE (newargs)))
974 oldargs = TREE_CHAIN (oldargs);
975 newargs = TREE_CHAIN (newargs);
978 trytype = build_function_type (newrettype, tryargs);
979 return build_type_attribute_variant (trytype, TYPE_ATTRIBUTES (oldtype));
982 /* Subroutine of diagnose_mismatched_decls. Check for function type
983 mismatch involving an empty arglist vs a nonempty one and give clearer
986 diagnose_arglist_conflict (tree newdecl, tree olddecl,
987 tree newtype, tree oldtype)
991 if (TREE_CODE (olddecl) != FUNCTION_DECL
992 || !comptypes (TREE_TYPE (oldtype), TREE_TYPE (newtype))
993 || !((TYPE_ARG_TYPES (oldtype) == 0 && DECL_INITIAL (olddecl) == 0)
995 (TYPE_ARG_TYPES (newtype) == 0 && DECL_INITIAL (newdecl) == 0)))
998 t = TYPE_ARG_TYPES (oldtype);
1000 t = TYPE_ARG_TYPES (newtype);
1001 for (; t; t = TREE_CHAIN (t))
1003 tree type = TREE_VALUE (t);
1005 if (TREE_CHAIN (t) == 0
1006 && TYPE_MAIN_VARIANT (type) != void_type_node)
1008 inform ("a parameter list with an ellipsis can%'t match "
1009 "an empty parameter name list declaration");
1013 if (c_type_promotes_to (type) != type)
1015 inform ("an argument type that has a default promotion can%'t match "
1016 "an empty parameter name list declaration");
1022 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1023 old-style function definition, NEWDECL is a prototype declaration.
1024 Diagnose inconsistencies in the argument list. Returns TRUE if
1025 the prototype is compatible, FALSE if not. */
1027 validate_proto_after_old_defn (tree newdecl, tree newtype, tree oldtype)
1029 tree newargs, oldargs;
1032 /* ??? Elsewhere TYPE_MAIN_VARIANT is not used in this context. */
1033 #define END_OF_ARGLIST(t) (TYPE_MAIN_VARIANT (t) == void_type_node)
1035 oldargs = TYPE_ACTUAL_ARG_TYPES (oldtype);
1036 newargs = TYPE_ARG_TYPES (newtype);
1041 tree oldargtype = TREE_VALUE (oldargs);
1042 tree newargtype = TREE_VALUE (newargs);
1044 if (END_OF_ARGLIST (oldargtype) && END_OF_ARGLIST (newargtype))
1047 /* Reaching the end of just one list means the two decls don't
1048 agree on the number of arguments. */
1049 if (END_OF_ARGLIST (oldargtype))
1051 error ("%Jprototype for %qD declares more arguments "
1052 "than previous old-style definition", newdecl, newdecl);
1055 else if (END_OF_ARGLIST (newargtype))
1057 error ("%Jprototype for %qD declares fewer arguments "
1058 "than previous old-style definition", newdecl, newdecl);
1062 /* Type for passing arg must be consistent with that declared
1064 else if (!comptypes (oldargtype, newargtype))
1066 error ("%Jprototype for %qD declares argument %d"
1067 " with incompatible type",
1068 newdecl, newdecl, i);
1072 oldargs = TREE_CHAIN (oldargs);
1073 newargs = TREE_CHAIN (newargs);
1077 /* If we get here, no errors were found, but do issue a warning
1078 for this poor-style construct. */
1079 warning ("%Jprototype for %qD follows non-prototype definition",
1082 #undef END_OF_ARGLIST
1085 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1086 first in a pair of mismatched declarations, using the diagnostic
1089 locate_old_decl (tree decl, void (*diag)(const char *, ...))
1091 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
1093 else if (DECL_INITIAL (decl))
1094 diag (N_("%Jprevious definition of %qD was here"), decl, decl);
1095 else if (C_DECL_IMPLICIT (decl))
1096 diag (N_("%Jprevious implicit declaration of %qD was here"), decl, decl);
1098 diag (N_("%Jprevious declaration of %qD was here"), decl, decl);
1101 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1102 Returns true if the caller should proceed to merge the two, false
1103 if OLDDECL should simply be discarded. As a side effect, issues
1104 all necessary diagnostics for invalid or poor-style combinations.
1105 If it returns true, writes the types of NEWDECL and OLDDECL to
1106 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1107 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1110 diagnose_mismatched_decls (tree newdecl, tree olddecl,
1111 tree *newtypep, tree *oldtypep)
1113 tree newtype, oldtype;
1114 bool pedwarned = false;
1115 bool warned = false;
1117 /* If we have error_mark_node for either decl or type, just discard
1118 the previous decl - we're in an error cascade already. */
1119 if (olddecl == error_mark_node || newdecl == error_mark_node)
1121 *oldtypep = oldtype = TREE_TYPE (olddecl);
1122 *newtypep = newtype = TREE_TYPE (newdecl);
1123 if (oldtype == error_mark_node || newtype == error_mark_node)
1126 /* Two different categories of symbol altogether. This is an error
1127 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1128 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1130 if (!(TREE_CODE (olddecl) == FUNCTION_DECL
1131 && DECL_BUILT_IN (olddecl)
1132 && !C_DECL_DECLARED_BUILTIN (olddecl)))
1134 error ("%J%qD redeclared as different kind of symbol",
1136 locate_old_decl (olddecl, error);
1138 else if (TREE_PUBLIC (newdecl))
1139 warning ("%Jbuilt-in function %qD declared as non-function",
1141 else if (warn_shadow)
1142 warning ("%Jdeclaration of %qD shadows a built-in function",
1147 /* Enumerators have no linkage, so may only be declared once in a
1149 if (TREE_CODE (olddecl) == CONST_DECL)
1151 error ("%Jredeclaration of enumerator %qD", newdecl, newdecl);
1152 locate_old_decl (olddecl, error);
1156 if (!comptypes (oldtype, newtype))
1158 if (TREE_CODE (olddecl) == FUNCTION_DECL
1159 && DECL_BUILT_IN (olddecl) && !C_DECL_DECLARED_BUILTIN (olddecl))
1161 /* Accept harmless mismatch in function types.
1162 This is for the ffs and fprintf builtins. */
1163 tree trytype = match_builtin_function_types (newtype, oldtype);
1165 if (trytype && comptypes (newtype, trytype))
1166 *oldtypep = oldtype = trytype;
1169 /* If types don't match for a built-in, throw away the
1170 built-in. No point in calling locate_old_decl here, it
1171 won't print anything. */
1172 warning ("%Jconflicting types for built-in function %qD",
1177 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1178 && DECL_IS_BUILTIN (olddecl))
1180 /* A conflicting function declaration for a predeclared
1181 function that isn't actually built in. Objective C uses
1182 these. The new declaration silently overrides everything
1183 but the volatility (i.e. noreturn) indication. See also
1184 below. FIXME: Make Objective C use normal builtins. */
1185 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1188 /* Permit void foo (...) to match int foo (...) if the latter is
1189 the definition and implicit int was used. See
1190 c-torture/compile/920625-2.c. */
1191 else if (TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl)
1192 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
1193 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
1194 && C_FUNCTION_IMPLICIT_INT (newdecl) && !DECL_INITIAL (olddecl))
1196 pedwarn ("%Jconflicting types for %qD", newdecl, newdecl);
1197 /* Make sure we keep void as the return type. */
1198 TREE_TYPE (newdecl) = *newtypep = newtype = oldtype;
1199 C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
1202 /* Permit void foo (...) to match an earlier call to foo (...) with
1203 no declared type (thus, implicitly int). */
1204 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1205 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == void_type_node
1206 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == integer_type_node
1207 && C_DECL_IMPLICIT (olddecl) && !DECL_INITIAL (olddecl))
1209 pedwarn ("%Jconflicting types for %qD", newdecl, newdecl);
1210 /* Make sure we keep void as the return type. */
1211 TREE_TYPE (olddecl) = *oldtypep = oldtype = newtype;
1216 if (TYPE_QUALS (newtype) != TYPE_QUALS (oldtype))
1217 error ("%J conflicting type qualifiers for %qD", newdecl, newdecl);
1219 error ("%Jconflicting types for %qD", newdecl, newdecl);
1220 diagnose_arglist_conflict (newdecl, olddecl, newtype, oldtype);
1221 locate_old_decl (olddecl, error);
1226 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1227 but silently ignore the redeclaration if either is in a system
1228 header. (Conflicting redeclarations were handled above.) */
1229 if (TREE_CODE (newdecl) == TYPE_DECL)
1231 if (DECL_IN_SYSTEM_HEADER (newdecl) || DECL_IN_SYSTEM_HEADER (olddecl))
1232 return true; /* Allow OLDDECL to continue in use. */
1234 error ("%Jredefinition of typedef %qD", newdecl, newdecl);
1235 locate_old_decl (olddecl, error);
1239 /* Function declarations can either be 'static' or 'extern' (no
1240 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1241 can never conflict with each other on account of linkage (6.2.2p4).
1242 Multiple definitions are not allowed (6.9p3,5) but GCC permits
1243 two definitions if one is 'extern inline' and one is not. The non-
1244 extern-inline definition supersedes the extern-inline definition. */
1245 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1247 /* If you declare a built-in function name as static, or
1248 define the built-in with an old-style definition (so we
1249 can't validate the argument list) the built-in definition is
1250 overridden, but optionally warn this was a bad choice of name. */
1251 if (DECL_BUILT_IN (olddecl)
1252 && !C_DECL_DECLARED_BUILTIN (olddecl)
1253 && (!TREE_PUBLIC (newdecl)
1254 || (DECL_INITIAL (newdecl)
1255 && !TYPE_ARG_TYPES (TREE_TYPE (newdecl)))))
1258 warning ("%Jdeclaration of %qD shadows a built-in function",
1260 /* Discard the old built-in function. */
1264 if (DECL_INITIAL (newdecl))
1266 if (DECL_INITIAL (olddecl)
1267 && !(DECL_DECLARED_INLINE_P (olddecl)
1268 && DECL_EXTERNAL (olddecl)
1269 && !(DECL_DECLARED_INLINE_P (newdecl)
1270 && DECL_EXTERNAL (newdecl)
1271 && same_translation_unit_p (olddecl, newdecl))))
1273 error ("%Jredefinition of %qD", newdecl, newdecl);
1274 locate_old_decl (olddecl, error);
1278 /* If we have a prototype after an old-style function definition,
1279 the argument types must be checked specially. */
1280 else if (DECL_INITIAL (olddecl)
1281 && !TYPE_ARG_TYPES (oldtype) && TYPE_ARG_TYPES (newtype)
1282 && TYPE_ACTUAL_ARG_TYPES (oldtype)
1283 && !validate_proto_after_old_defn (newdecl, newtype, oldtype))
1285 locate_old_decl (olddecl, error);
1288 /* A non-static declaration (even an "extern") followed by a
1289 static declaration is undefined behavior per C99 6.2.2p3-5,7.
1290 The same is true for a static forward declaration at block
1291 scope followed by a non-static declaration/definition at file
1292 scope. Static followed by non-static at the same scope is
1293 not undefined behavior, and is the most convenient way to get
1294 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
1295 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
1296 we do diagnose it if -Wtraditional. */
1297 if (TREE_PUBLIC (olddecl) && !TREE_PUBLIC (newdecl))
1299 /* Two exceptions to the rule. If olddecl is an extern
1300 inline, or a predeclared function that isn't actually
1301 built in, newdecl silently overrides olddecl. The latter
1302 occur only in Objective C; see also above. (FIXME: Make
1303 Objective C use normal builtins.) */
1304 if (!DECL_IS_BUILTIN (olddecl)
1305 && !(DECL_EXTERNAL (olddecl)
1306 && DECL_DECLARED_INLINE_P (olddecl)))
1308 error ("%Jstatic declaration of %qD follows "
1309 "non-static declaration", newdecl, newdecl);
1310 locate_old_decl (olddecl, error);
1314 else if (TREE_PUBLIC (newdecl) && !TREE_PUBLIC (olddecl))
1316 if (DECL_CONTEXT (olddecl))
1318 error ("%Jnon-static declaration of %qD follows "
1319 "static declaration", newdecl, newdecl);
1320 locate_old_decl (olddecl, error);
1323 else if (warn_traditional)
1325 warning ("%Jnon-static declaration of %qD follows "
1326 "static declaration", newdecl, newdecl);
1331 else if (TREE_CODE (newdecl) == VAR_DECL)
1333 /* Only variables can be thread-local, and all declarations must
1334 agree on this property. */
1335 if (DECL_THREAD_LOCAL (newdecl) != DECL_THREAD_LOCAL (olddecl))
1337 if (DECL_THREAD_LOCAL (newdecl))
1338 error ("%Jthread-local declaration of %qD follows "
1339 "non-thread-local declaration", newdecl, newdecl);
1341 error ("%Jnon-thread-local declaration of %qD follows "
1342 "thread-local declaration", newdecl, newdecl);
1344 locate_old_decl (olddecl, error);
1348 /* Multiple initialized definitions are not allowed (6.9p3,5). */
1349 if (DECL_INITIAL (newdecl) && DECL_INITIAL (olddecl))
1351 error ("%Jredefinition of %qD", newdecl, newdecl);
1352 locate_old_decl (olddecl, error);
1356 /* Objects declared at file scope: if the first declaration had
1357 external linkage (even if it was an external reference) the
1358 second must have external linkage as well, or the behavior is
1359 undefined. If the first declaration had internal linkage, then
1360 the second must too, or else be an external reference (in which
1361 case the composite declaration still has internal linkage).
1362 As for function declarations, we warn about the static-then-
1363 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
1364 if (DECL_FILE_SCOPE_P (newdecl)
1365 && TREE_PUBLIC (newdecl) != TREE_PUBLIC (olddecl))
1367 if (DECL_EXTERNAL (newdecl))
1369 if (!DECL_FILE_SCOPE_P (olddecl))
1371 error ("%Jextern declaration of %qD follows "
1372 "declaration with no linkage", newdecl, newdecl);
1373 locate_old_decl (olddecl, error);
1376 else if (warn_traditional)
1378 warning ("%Jnon-static declaration of %qD follows "
1379 "static declaration", newdecl, newdecl);
1385 if (TREE_PUBLIC (newdecl))
1386 error ("%Jnon-static declaration of %qD follows "
1387 "static declaration", newdecl, newdecl);
1389 error ("%Jstatic declaration of %qD follows "
1390 "non-static declaration", newdecl, newdecl);
1392 locate_old_decl (olddecl, error);
1396 /* Two objects with the same name declared at the same block
1397 scope must both be external references (6.7p3). */
1398 else if (!DECL_FILE_SCOPE_P (newdecl))
1400 if (DECL_EXTERNAL (newdecl))
1402 /* Extern with initializer at block scope, which will
1403 already have received an error. */
1405 else if (DECL_EXTERNAL (olddecl))
1407 error ("%Jdeclaration of %qD with no linkage follows "
1408 "extern declaration", newdecl, newdecl);
1409 locate_old_decl (olddecl, error);
1413 error ("%Jredeclaration of %qD with no linkage",
1415 locate_old_decl (olddecl, error);
1423 /* All decls must agree on a visibility. */
1424 if (DECL_VISIBILITY_SPECIFIED (newdecl) && DECL_VISIBILITY_SPECIFIED (olddecl)
1425 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
1427 warning ("%Jredeclaration of %qD with different visibility "
1428 "(old visibility preserved)", newdecl, newdecl);
1432 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1434 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
1435 if (DECL_DECLARED_INLINE_P (newdecl)
1436 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1438 warning ("%Jinline declaration of %qD follows "
1439 "declaration with attribute noinline", newdecl, newdecl);
1442 else if (DECL_DECLARED_INLINE_P (olddecl)
1443 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1445 warning ("%Jdeclaration of %qD with attribute noinline follows "
1446 "inline declaration ", newdecl, newdecl);
1450 /* Inline declaration after use or definition.
1451 ??? Should we still warn about this now we have unit-at-a-time
1452 mode and can get it right?
1453 Definitely don't complain if the decls are in different translation
1455 if (DECL_DECLARED_INLINE_P (newdecl) && !DECL_DECLARED_INLINE_P (olddecl)
1456 && same_translation_unit_p (olddecl, newdecl))
1458 if (TREE_USED (olddecl))
1460 warning ("%J%qD declared inline after being called",
1464 else if (DECL_INITIAL (olddecl))
1466 warning ("%J%qD declared inline after its definition",
1472 else /* PARM_DECL, VAR_DECL */
1474 /* Redeclaration of a parameter is a constraint violation (this is
1475 not explicitly stated, but follows from C99 6.7p3 [no more than
1476 one declaration of the same identifier with no linkage in the
1477 same scope, except type tags] and 6.2.2p6 [parameters have no
1478 linkage]). We must check for a forward parameter declaration,
1479 indicated by TREE_ASM_WRITTEN on the old declaration - this is
1480 an extension, the mandatory diagnostic for which is handled by
1481 mark_forward_parm_decls. */
1483 if (TREE_CODE (newdecl) == PARM_DECL
1484 && (!TREE_ASM_WRITTEN (olddecl) || TREE_ASM_WRITTEN (newdecl)))
1486 error ("%Jredefinition of parameter %qD", newdecl, newdecl);
1487 locate_old_decl (olddecl, error);
1492 /* Optional warning for completely redundant decls. */
1493 if (!warned && !pedwarned
1494 && warn_redundant_decls
1495 /* Don't warn about a function declaration followed by a
1497 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1498 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl))
1499 /* Don't warn about redundant redeclarations of builtins. */
1500 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1501 && !DECL_BUILT_IN (newdecl)
1502 && DECL_BUILT_IN (olddecl)
1503 && !C_DECL_DECLARED_BUILTIN (olddecl))
1504 /* Don't warn about an extern followed by a definition. */
1505 && !(DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl))
1506 /* Don't warn about forward parameter decls. */
1507 && !(TREE_CODE (newdecl) == PARM_DECL
1508 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl)))
1510 warning ("%Jredundant redeclaration of %qD", newdecl, newdecl);
1514 /* Report location of previous decl/defn in a consistent manner. */
1515 if (warned || pedwarned)
1516 locate_old_decl (olddecl, pedwarned ? pedwarn : warning);
1521 /* Subroutine of duplicate_decls. NEWDECL has been found to be
1522 consistent with OLDDECL, but carries new information. Merge the
1523 new information into OLDDECL. This function issues no
1527 merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype)
1529 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1530 && DECL_INITIAL (newdecl) != 0);
1532 /* For real parm decl following a forward decl, rechain the old decl
1533 in its new location and clear TREE_ASM_WRITTEN (it's not a
1534 forward decl anymore). */
1535 if (TREE_CODE (newdecl) == PARM_DECL
1536 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
1538 struct c_binding *b, **here;
1540 for (here = ¤t_scope->bindings; *here; here = &(*here)->prev)
1541 if ((*here)->decl == olddecl)
1548 b->prev = current_scope->bindings;
1549 current_scope->bindings = b;
1551 TREE_ASM_WRITTEN (olddecl) = 0;
1554 DECL_ATTRIBUTES (newdecl)
1555 = targetm.merge_decl_attributes (olddecl, newdecl);
1557 /* Merge the data types specified in the two decls. */
1559 = TREE_TYPE (olddecl)
1560 = composite_type (newtype, oldtype);
1562 /* Lay the type out, unless already done. */
1563 if (!comptypes (oldtype, TREE_TYPE (newdecl)))
1565 if (TREE_TYPE (newdecl) != error_mark_node)
1566 layout_type (TREE_TYPE (newdecl));
1567 if (TREE_CODE (newdecl) != FUNCTION_DECL
1568 && TREE_CODE (newdecl) != TYPE_DECL
1569 && TREE_CODE (newdecl) != CONST_DECL)
1570 layout_decl (newdecl, 0);
1574 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1575 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1576 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1577 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1578 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1579 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1581 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1582 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1586 /* Keep the old rtl since we can safely use it. */
1587 COPY_DECL_RTL (olddecl, newdecl);
1589 /* Merge the type qualifiers. */
1590 if (TREE_READONLY (newdecl))
1591 TREE_READONLY (olddecl) = 1;
1593 if (TREE_THIS_VOLATILE (newdecl))
1595 TREE_THIS_VOLATILE (olddecl) = 1;
1596 if (TREE_CODE (newdecl) == VAR_DECL)
1597 make_var_volatile (newdecl);
1600 /* Merge deprecatedness. */
1601 if (TREE_DEPRECATED (newdecl))
1602 TREE_DEPRECATED (olddecl) = 1;
1604 /* Keep source location of definition rather than declaration. */
1605 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
1606 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1608 /* Merge the unused-warning information. */
1609 if (DECL_IN_SYSTEM_HEADER (olddecl))
1610 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1611 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1612 DECL_IN_SYSTEM_HEADER (olddecl) = 1;
1614 /* Merge the initialization information. */
1615 if (DECL_INITIAL (newdecl) == 0)
1616 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1618 /* Merge the section attribute.
1619 We want to issue an error if the sections conflict but that must be
1620 done later in decl_attributes since we are called before attributes
1622 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1623 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1625 /* Copy the assembler name.
1626 Currently, it can only be defined in the prototype. */
1627 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1629 /* Use visibility of whichever declaration had it specified */
1630 if (DECL_VISIBILITY_SPECIFIED (olddecl))
1632 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
1633 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
1636 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1638 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1639 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1640 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1641 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1642 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1643 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1644 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1645 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1646 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
1649 /* Merge the storage class information. */
1650 merge_weak (newdecl, olddecl);
1652 /* For functions, static overrides non-static. */
1653 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1655 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1656 /* This is since we don't automatically
1657 copy the attributes of NEWDECL into OLDDECL. */
1658 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1659 /* If this clears `static', clear it in the identifier too. */
1660 if (!TREE_PUBLIC (olddecl))
1661 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1663 if (DECL_EXTERNAL (newdecl))
1665 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1666 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1668 /* An extern decl does not override previous storage class. */
1669 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1670 if (!DECL_EXTERNAL (newdecl))
1672 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1673 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
1678 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1679 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1682 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1684 /* If we're redefining a function previously defined as extern
1685 inline, make sure we emit debug info for the inline before we
1686 throw it away, in case it was inlined into a function that hasn't
1687 been written out yet. */
1688 if (new_is_definition && DECL_INITIAL (olddecl))
1690 if (TREE_USED (olddecl)
1691 /* In unit-at-a-time mode we never inline re-defined extern
1692 inline functions. */
1693 && !flag_unit_at_a_time
1694 && cgraph_function_possibly_inlined_p (olddecl))
1695 (*debug_hooks->outlining_inline_function) (olddecl);
1697 /* The new defn must not be inline. */
1698 DECL_INLINE (newdecl) = 0;
1699 DECL_UNINLINABLE (newdecl) = 1;
1703 /* If either decl says `inline', this fn is inline,
1704 unless its definition was passed already. */
1705 if (DECL_DECLARED_INLINE_P (newdecl)
1706 || DECL_DECLARED_INLINE_P (olddecl))
1707 DECL_DECLARED_INLINE_P (newdecl) = 1;
1709 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1710 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1713 if (DECL_BUILT_IN (olddecl))
1715 /* If redeclaring a builtin function, it stays built in.
1716 But it gets tagged as having been declared. */
1717 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1718 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1719 C_DECL_DECLARED_BUILTIN (newdecl) = 1;
1722 /* Also preserve various other info from the definition. */
1723 if (!new_is_definition)
1725 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1726 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1727 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1728 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1729 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1731 /* Set DECL_INLINE on the declaration if we've got a body
1732 from which to instantiate. */
1733 if (DECL_INLINE (olddecl) && !DECL_UNINLINABLE (newdecl))
1735 DECL_INLINE (newdecl) = 1;
1736 DECL_ABSTRACT_ORIGIN (newdecl)
1737 = DECL_ABSTRACT_ORIGIN (olddecl);
1742 /* If a previous declaration said inline, mark the
1743 definition as inlinable. */
1744 if (DECL_DECLARED_INLINE_P (newdecl)
1745 && !DECL_UNINLINABLE (newdecl))
1746 DECL_INLINE (newdecl) = 1;
1750 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1751 But preserve OLDDECL's DECL_UID and DECL_CONTEXT. */
1753 unsigned olddecl_uid = DECL_UID (olddecl);
1754 tree olddecl_context = DECL_CONTEXT (olddecl);
1756 memcpy ((char *) olddecl + sizeof (struct tree_common),
1757 (char *) newdecl + sizeof (struct tree_common),
1758 sizeof (struct tree_decl) - sizeof (struct tree_common));
1759 DECL_UID (olddecl) = olddecl_uid;
1760 DECL_CONTEXT (olddecl) = olddecl_context;
1763 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1764 so that encode_section_info has a chance to look at the new decl
1765 flags and attributes. */
1766 if (DECL_RTL_SET_P (olddecl)
1767 && (TREE_CODE (olddecl) == FUNCTION_DECL
1768 || (TREE_CODE (olddecl) == VAR_DECL
1769 && TREE_STATIC (olddecl))))
1770 make_decl_rtl (olddecl);
1773 /* Handle when a new declaration NEWDECL has the same name as an old
1774 one OLDDECL in the same binding contour. Prints an error message
1777 If safely possible, alter OLDDECL to look like NEWDECL, and return
1778 true. Otherwise, return false. */
1781 duplicate_decls (tree newdecl, tree olddecl)
1783 tree newtype = NULL, oldtype = NULL;
1785 if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype))
1788 merge_decls (newdecl, olddecl, newtype, oldtype);
1793 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
1795 warn_if_shadowing (tree new_decl)
1797 struct c_binding *b;
1799 /* Shadow warnings wanted? */
1801 /* No shadow warnings for internally generated vars. */
1802 || DECL_IS_BUILTIN (new_decl)
1803 /* No shadow warnings for vars made for inlining. */
1804 || DECL_FROM_INLINE (new_decl)
1805 /* Don't warn about the parm names in function declarator
1806 within a function declarator. It would be nice to avoid
1807 warning in any function declarator in a declaration, as
1808 opposed to a definition, but there is no way to tell
1809 it's not a definition at this point. */
1810 || (TREE_CODE (new_decl) == PARM_DECL && current_scope->outer->parm_flag))
1813 /* Is anything being shadowed? Invisible decls do not count. */
1814 for (b = I_SYMBOL_BINDING (DECL_NAME (new_decl)); b; b = b->shadowed)
1815 if (b->decl && b->decl != new_decl && !b->invisible)
1817 tree old_decl = b->decl;
1819 if (TREE_CODE (old_decl) == PARM_DECL)
1820 warning ("%Jdeclaration of %qD shadows a parameter",
1821 new_decl, new_decl);
1822 else if (DECL_FILE_SCOPE_P (old_decl))
1823 warning ("%Jdeclaration of %qD shadows a global declaration",
1824 new_decl, new_decl);
1825 else if (TREE_CODE (old_decl) == FUNCTION_DECL
1826 && DECL_BUILT_IN (old_decl))
1827 warning ("%Jdeclaration of %qD shadows a built-in function",
1828 new_decl, new_decl);
1830 warning ("%Jdeclaration of %qD shadows a previous local",
1831 new_decl, new_decl);
1833 if (TREE_CODE (old_decl) != FUNCTION_DECL
1834 || !DECL_BUILT_IN (old_decl))
1835 warning ("%Jshadowed declaration is here", old_decl);
1842 /* Subroutine of pushdecl.
1844 X is a TYPE_DECL for a typedef statement. Create a brand new
1845 ..._TYPE node (which will be just a variant of the existing
1846 ..._TYPE node with identical properties) and then install X
1847 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1849 The whole point here is to end up with a situation where each
1850 and every ..._TYPE node the compiler creates will be uniquely
1851 associated with AT MOST one node representing a typedef name.
1852 This way, even though the compiler substitutes corresponding
1853 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1854 early on, later parts of the compiler can always do the reverse
1855 translation and get back the corresponding typedef name. For
1858 typedef struct S MY_TYPE;
1861 Later parts of the compiler might only know that `object' was of
1862 type `struct S' if it were not for code just below. With this
1863 code however, later parts of the compiler see something like:
1865 struct S' == struct S
1866 typedef struct S' MY_TYPE;
1869 And they can then deduce (from the node for type struct S') that
1870 the original object declaration was:
1874 Being able to do this is important for proper support of protoize,
1875 and also for generating precise symbolic debugging information
1876 which takes full account of the programmer's (typedef) vocabulary.
1878 Obviously, we don't want to generate a duplicate ..._TYPE node if
1879 the TYPE_DECL node that we are now processing really represents a
1880 standard built-in type.
1882 Since all standard types are effectively declared at line zero
1883 in the source file, we can easily check to see if we are working
1884 on a standard type by checking the current value of lineno. */
1887 clone_underlying_type (tree x)
1889 if (DECL_IS_BUILTIN (x))
1891 if (TYPE_NAME (TREE_TYPE (x)) == 0)
1892 TYPE_NAME (TREE_TYPE (x)) = x;
1894 else if (TREE_TYPE (x) != error_mark_node
1895 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
1897 tree tt = TREE_TYPE (x);
1898 DECL_ORIGINAL_TYPE (x) = tt;
1899 tt = build_variant_type_copy (tt);
1901 TREE_USED (tt) = TREE_USED (x);
1906 /* Record a decl-node X as belonging to the current lexical scope.
1907 Check for errors (such as an incompatible declaration for the same
1908 name already seen in the same scope).
1910 Returns either X or an old decl for the same name.
1911 If an old decl is returned, it may have been smashed
1912 to agree with what X says. */
1917 tree name = DECL_NAME (x);
1918 struct c_scope *scope = current_scope;
1919 struct c_binding *b;
1920 bool nested = false;
1922 /* Functions need the lang_decl data. */
1923 if (TREE_CODE (x) == FUNCTION_DECL && !DECL_LANG_SPECIFIC (x))
1924 DECL_LANG_SPECIFIC (x) = GGC_CNEW (struct lang_decl);
1926 /* Must set DECL_CONTEXT for everything not at file scope or
1927 DECL_FILE_SCOPE_P won't work. Local externs don't count
1928 unless they have initializers (which generate code). */
1929 if (current_function_decl
1930 && ((TREE_CODE (x) != FUNCTION_DECL && TREE_CODE (x) != VAR_DECL)
1931 || DECL_INITIAL (x) || !DECL_EXTERNAL (x)))
1932 DECL_CONTEXT (x) = current_function_decl;
1934 /* Anonymous decls are just inserted in the scope. */
1937 bind (name, x, scope, /*invisible=*/false, /*nested=*/false);
1941 /* First, see if there is another declaration with the same name in
1942 the current scope. If there is, duplicate_decls may do all the
1943 work for us. If duplicate_decls returns false, that indicates
1944 two incompatible decls in the same scope; we are to silently
1945 replace the old one (duplicate_decls has issued all appropriate
1946 diagnostics). In particular, we should not consider possible
1947 duplicates in the external scope, or shadowing. */
1948 b = I_SYMBOL_BINDING (name);
1949 if (b && B_IN_SCOPE (b, scope))
1951 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
1952 && COMPLETE_TYPE_P (TREE_TYPE (x)))
1953 b->inner_comp = false;
1954 if (duplicate_decls (x, b->decl))
1957 goto skip_external_and_shadow_checks;
1960 /* All declarations with external linkage, and all external
1961 references, go in the external scope, no matter what scope is
1962 current. However, the binding in that scope is ignored for
1963 purposes of normal name lookup. A separate binding structure is
1964 created in the requested scope; this governs the normal
1965 visibility of the symbol.
1967 The binding in the externals scope is used exclusively for
1968 detecting duplicate declarations of the same object, no matter
1969 what scope they are in; this is what we do here. (C99 6.2.7p2:
1970 All declarations that refer to the same object or function shall
1971 have compatible type; otherwise, the behavior is undefined.) */
1972 if (DECL_EXTERNAL (x) || scope == file_scope)
1974 tree type = TREE_TYPE (x);
1977 bool type_saved = false;
1978 if (b && !B_IN_EXTERNAL_SCOPE (b)
1979 && (TREE_CODE (b->decl) == FUNCTION_DECL
1980 || TREE_CODE (b->decl) == VAR_DECL)
1981 && DECL_FILE_SCOPE_P (b->decl))
1984 vistype = TREE_TYPE (visdecl);
1986 if (warn_nested_externs
1987 && scope != file_scope
1988 && !DECL_IN_SYSTEM_HEADER (x))
1989 warning ("nested extern declaration of %qD", x);
1991 while (b && !B_IN_EXTERNAL_SCOPE (b))
1993 /* If this decl might be modified, save its type. This is
1994 done here rather than when the decl is first bound
1995 because the type may change after first binding, through
1996 being completed or through attributes being added. If we
1997 encounter multiple such decls, only the first should have
1998 its type saved; the others will already have had their
1999 proper types saved and the types will not have changed as
2000 their scopes will not have been re-entered. */
2001 if (DECL_FILE_SCOPE_P (b->decl) && !type_saved)
2003 b->type = TREE_TYPE (b->decl);
2006 if (B_IN_FILE_SCOPE (b)
2007 && TREE_CODE (b->decl) == VAR_DECL
2008 && TREE_STATIC (b->decl)
2009 && TREE_CODE (TREE_TYPE (b->decl)) == ARRAY_TYPE
2010 && !TYPE_DOMAIN (TREE_TYPE (b->decl))
2011 && TREE_CODE (type) == ARRAY_TYPE
2012 && TYPE_DOMAIN (type)
2013 && TYPE_MAX_VALUE (TYPE_DOMAIN (type))
2014 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type))))
2016 /* Array type completed in inner scope, which should be
2017 diagnosed if the completion does not have size 1 and
2018 it does not get completed in the file scope. */
2019 b->inner_comp = true;
2024 /* If a matching external declaration has been found, set its
2025 type to the composite of all the types of that declaration.
2026 After the consistency checks, it will be reset to the
2027 composite of the visible types only. */
2028 if (b && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2030 TREE_TYPE (b->decl) = b->type;
2032 /* The point of the same_translation_unit_p check here is,
2033 we want to detect a duplicate decl for a construct like
2034 foo() { extern bar(); } ... static bar(); but not if
2035 they are in different translation units. In any case,
2036 the static does not go in the externals scope. */
2038 && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2039 && duplicate_decls (x, b->decl))
2042 thistype = (vistype ? composite_type (vistype, type) : type);
2043 b->type = TREE_TYPE (b->decl);
2044 if (TREE_CODE (b->decl) == FUNCTION_DECL && DECL_BUILT_IN (b->decl))
2046 = build_type_attribute_variant (thistype,
2047 TYPE_ATTRIBUTES (b->type));
2048 TREE_TYPE (b->decl) = thistype;
2049 bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true);
2052 else if (TREE_PUBLIC (x))
2054 if (visdecl && !b && duplicate_decls (x, visdecl))
2056 /* An external declaration at block scope referring to a
2057 visible entity with internal linkage. The composite
2058 type will already be correct for this scope, so we
2059 just need to fall through to make the declaration in
2066 bind (name, x, external_scope, /*invisible=*/true,
2073 warn_if_shadowing (x);
2075 skip_external_and_shadow_checks:
2076 if (TREE_CODE (x) == TYPE_DECL)
2077 clone_underlying_type (x);
2079 bind (name, x, scope, /*invisible=*/false, nested);
2081 /* If x's type is incomplete because it's based on a
2082 structure or union which has not yet been fully declared,
2083 attach it to that structure or union type, so we can go
2084 back and complete the variable declaration later, if the
2085 structure or union gets fully declared.
2087 If the input is erroneous, we can have error_mark in the type
2088 slot (e.g. "f(void a, ...)") - that doesn't count as an
2090 if (TREE_TYPE (x) != error_mark_node
2091 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2093 tree element = TREE_TYPE (x);
2095 while (TREE_CODE (element) == ARRAY_TYPE)
2096 element = TREE_TYPE (element);
2097 element = TYPE_MAIN_VARIANT (element);
2099 if ((TREE_CODE (element) == RECORD_TYPE
2100 || TREE_CODE (element) == UNION_TYPE)
2101 && (TREE_CODE (x) != TYPE_DECL
2102 || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE)
2103 && !COMPLETE_TYPE_P (element))
2104 C_TYPE_INCOMPLETE_VARS (element)
2105 = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element));
2110 /* Record X as belonging to file scope.
2111 This is used only internally by the Objective-C front end,
2112 and is limited to its needs. duplicate_decls is not called;
2113 if there is any preexisting decl for this identifier, it is an ICE. */
2116 pushdecl_top_level (tree x)
2119 bool nested = false;
2120 gcc_assert (TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == CONST_DECL);
2122 name = DECL_NAME (x);
2124 gcc_assert (TREE_CODE (x) == CONST_DECL || !I_SYMBOL_BINDING (name));
2126 if (TREE_PUBLIC (x))
2128 bind (name, x, external_scope, /*invisible=*/true, /*nested=*/false);
2132 bind (name, x, file_scope, /*invisible=*/false, nested);
2138 implicit_decl_warning (tree id, tree olddecl)
2140 void (*diag) (const char *, ...);
2141 switch (mesg_implicit_function_declaration)
2144 case 1: diag = warning; break;
2145 case 2: diag = error; break;
2146 default: gcc_unreachable ();
2149 diag (N_("implicit declaration of function %qE"), id);
2151 locate_old_decl (olddecl, diag);
2154 /* Generate an implicit declaration for identifier FUNCTIONID as a
2155 function of type int (). */
2158 implicitly_declare (tree functionid)
2160 struct c_binding *b;
2164 for (b = I_SYMBOL_BINDING (functionid); b; b = b->shadowed)
2166 if (B_IN_SCOPE (b, external_scope))
2175 /* FIXME: Objective-C has weird not-really-builtin functions
2176 which are supposed to be visible automatically. They wind up
2177 in the external scope because they're pushed before the file
2178 scope gets created. Catch this here and rebind them into the
2180 if (!DECL_BUILT_IN (decl) && DECL_IS_BUILTIN (decl))
2182 bind (functionid, decl, file_scope,
2183 /*invisible=*/false, /*nested=*/true);
2188 tree newtype = default_function_type;
2190 TREE_TYPE (decl) = b->type;
2191 /* Implicit declaration of a function already declared
2192 (somehow) in a different scope, or as a built-in.
2193 If this is the first time this has happened, warn;
2194 then recycle the old declaration but with the new type. */
2195 if (!C_DECL_IMPLICIT (decl))
2197 implicit_decl_warning (functionid, decl);
2198 C_DECL_IMPLICIT (decl) = 1;
2200 if (DECL_BUILT_IN (decl))
2202 newtype = build_type_attribute_variant (newtype,
2204 (TREE_TYPE (decl)));
2205 if (!comptypes (newtype, TREE_TYPE (decl)))
2207 warning ("incompatible implicit declaration of built-in"
2208 " function %qD", decl);
2209 newtype = TREE_TYPE (decl);
2214 if (!comptypes (newtype, TREE_TYPE (decl)))
2216 error ("incompatible implicit declaration of function %qD",
2218 locate_old_decl (decl, error);
2221 b->type = TREE_TYPE (decl);
2222 TREE_TYPE (decl) = newtype;
2223 bind (functionid, decl, current_scope,
2224 /*invisible=*/false, /*nested=*/true);
2229 /* Not seen before. */
2230 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2231 DECL_EXTERNAL (decl) = 1;
2232 TREE_PUBLIC (decl) = 1;
2233 C_DECL_IMPLICIT (decl) = 1;
2234 implicit_decl_warning (functionid, 0);
2235 asmspec_tree = maybe_apply_renaming_pragma (decl, /*asmname=*/NULL);
2237 set_user_assembler_name (decl, TREE_STRING_POINTER (asmspec_tree));
2239 /* C89 says implicit declarations are in the innermost block.
2240 So we record the decl in the standard fashion. */
2241 decl = pushdecl (decl);
2243 /* No need to call objc_check_decl here - it's a function type. */
2244 rest_of_decl_compilation (decl, 0, 0);
2246 /* Write a record describing this implicit function declaration
2247 to the prototypes file (if requested). */
2248 gen_aux_info_record (decl, 0, 1, 0);
2250 /* Possibly apply some default attributes to this implicit declaration. */
2251 decl_attributes (&decl, NULL_TREE, 0);
2256 /* Issue an error message for a reference to an undeclared variable
2257 ID, including a reference to a builtin outside of function-call
2258 context. Establish a binding of the identifier to error_mark_node
2259 in an appropriate scope, which will suppress further errors for the
2262 undeclared_variable (tree id)
2264 static bool already = false;
2265 struct c_scope *scope;
2267 if (current_function_decl == 0)
2269 error ("%qE undeclared here (not in a function)", id);
2270 scope = current_scope;
2274 error ("%qE undeclared (first use in this function)", id);
2278 error ("(Each undeclared identifier is reported only once");
2279 error ("for each function it appears in.)");
2283 /* If we are parsing old-style parameter decls, current_function_decl
2284 will be nonnull but current_function_scope will be null. */
2285 scope = current_function_scope ? current_function_scope : current_scope;
2287 bind (id, error_mark_node, scope, /*invisible=*/false, /*nested=*/false);
2290 /* Subroutine of lookup_label, declare_label, define_label: construct a
2291 LABEL_DECL with all the proper frills. */
2294 make_label (tree name, location_t location)
2296 tree label = build_decl (LABEL_DECL, name, void_type_node);
2298 DECL_CONTEXT (label) = current_function_decl;
2299 DECL_MODE (label) = VOIDmode;
2300 DECL_SOURCE_LOCATION (label) = location;
2305 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
2306 Create one if none exists so far for the current function.
2307 This is called when a label is used in a goto expression or
2308 has its address taken. */
2311 lookup_label (tree name)
2315 if (current_function_decl == 0)
2317 error ("label %qs referenced outside of any function",
2318 IDENTIFIER_POINTER (name));
2322 /* Use a label already defined or ref'd with this name, but not if
2323 it is inherited from a containing function and wasn't declared
2325 label = I_LABEL_DECL (name);
2326 if (label && (DECL_CONTEXT (label) == current_function_decl
2327 || C_DECLARED_LABEL_FLAG (label)))
2329 /* If the label has only been declared, update its apparent
2330 location to point here, for better diagnostics if it
2331 turns out not to have been defined. */
2332 if (!TREE_USED (label))
2333 DECL_SOURCE_LOCATION (label) = input_location;
2337 /* No label binding for that identifier; make one. */
2338 label = make_label (name, input_location);
2340 /* Ordinary labels go in the current function scope. */
2341 bind (name, label, current_function_scope,
2342 /*invisible=*/false, /*nested=*/false);
2346 /* Make a label named NAME in the current function, shadowing silently
2347 any that may be inherited from containing functions or containing
2348 scopes. This is called for __label__ declarations. */
2351 declare_label (tree name)
2353 struct c_binding *b = I_LABEL_BINDING (name);
2356 /* Check to make sure that the label hasn't already been declared
2358 if (b && B_IN_CURRENT_SCOPE (b))
2360 error ("duplicate label declaration %qs", IDENTIFIER_POINTER (name));
2361 locate_old_decl (b->decl, error);
2363 /* Just use the previous declaration. */
2367 label = make_label (name, input_location);
2368 C_DECLARED_LABEL_FLAG (label) = 1;
2370 /* Declared labels go in the current scope. */
2371 bind (name, label, current_scope,
2372 /*invisible=*/false, /*nested=*/false);
2376 /* Define a label, specifying the location in the source file.
2377 Return the LABEL_DECL node for the label, if the definition is valid.
2378 Otherwise return 0. */
2381 define_label (location_t location, tree name)
2383 /* Find any preexisting label with this name. It is an error
2384 if that label has already been defined in this function, or
2385 if there is a containing function with a declared label with
2387 tree label = I_LABEL_DECL (name);
2390 && ((DECL_CONTEXT (label) == current_function_decl
2391 && DECL_INITIAL (label) != 0)
2392 || (DECL_CONTEXT (label) != current_function_decl
2393 && C_DECLARED_LABEL_FLAG (label))))
2395 error ("%Hduplicate label %qD", &location, label);
2396 locate_old_decl (label, error);
2399 else if (label && DECL_CONTEXT (label) == current_function_decl)
2401 /* The label has been used or declared already in this function,
2402 but not defined. Update its location to point to this
2404 DECL_SOURCE_LOCATION (label) = location;
2408 /* No label binding for that identifier; make one. */
2409 label = make_label (name, location);
2411 /* Ordinary labels go in the current function scope. */
2412 bind (name, label, current_function_scope,
2413 /*invisible=*/false, /*nested=*/false);
2416 if (warn_traditional && !in_system_header && lookup_name (name))
2417 warning ("%Htraditional C lacks a separate namespace for labels, "
2418 "identifier %qs conflicts", &location,
2419 IDENTIFIER_POINTER (name));
2421 /* Mark label as having been defined. */
2422 DECL_INITIAL (label) = error_mark_node;
2426 /* Given NAME, an IDENTIFIER_NODE,
2427 return the structure (or union or enum) definition for that name.
2428 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
2429 CODE says which kind of type the caller wants;
2430 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2431 If the wrong kind of type is found, an error is reported. */
2434 lookup_tag (enum tree_code code, tree name, int thislevel_only)
2436 struct c_binding *b = I_TAG_BINDING (name);
2442 /* We only care about whether it's in this level if
2443 thislevel_only was set or it might be a type clash. */
2444 if (thislevel_only || TREE_CODE (b->decl) != code)
2446 /* For our purposes, a tag in the external scope is the same as
2447 a tag in the file scope. (Primarily relevant to Objective-C
2448 and its builtin structure tags, which get pushed before the
2449 file scope is created.) */
2450 if (B_IN_CURRENT_SCOPE (b)
2451 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
2455 if (thislevel_only && !thislevel)
2458 if (TREE_CODE (b->decl) != code)
2460 /* Definition isn't the kind we were looking for. */
2461 pending_invalid_xref = name;
2462 pending_invalid_xref_location = input_location;
2464 /* If in the same binding level as a declaration as a tag
2465 of a different type, this must not be allowed to
2466 shadow that tag, so give the error immediately.
2467 (For example, "struct foo; union foo;" is invalid.) */
2469 pending_xref_error ();
2474 /* Print an error message now
2475 for a recent invalid struct, union or enum cross reference.
2476 We don't print them immediately because they are not invalid
2477 when used in the `struct foo;' construct for shadowing. */
2480 pending_xref_error (void)
2482 if (pending_invalid_xref != 0)
2483 error ("%H%qs defined as wrong kind of tag",
2484 &pending_invalid_xref_location,
2485 IDENTIFIER_POINTER (pending_invalid_xref));
2486 pending_invalid_xref = 0;
2490 /* Look up NAME in the current scope and its superiors
2491 in the namespace of variables, functions and typedefs.
2492 Return a ..._DECL node of some kind representing its definition,
2493 or return 0 if it is undefined. */
2496 lookup_name (tree name)
2498 struct c_binding *b = I_SYMBOL_BINDING (name);
2499 if (b && !b->invisible)
2504 /* Similar to `lookup_name' but look only at the indicated scope. */
2507 lookup_name_in_scope (tree name, struct c_scope *scope)
2509 struct c_binding *b;
2511 for (b = I_SYMBOL_BINDING (name); b; b = b->shadowed)
2512 if (B_IN_SCOPE (b, scope))
2517 /* Create the predefined scalar types of C,
2518 and some nodes representing standard constants (0, 1, (void *) 0).
2519 Initialize the global scope.
2520 Make definitions for built-in primitive functions. */
2523 c_init_decl_processing (void)
2526 tree ptr_ftype_void, ptr_ftype_ptr;
2527 location_t save_loc = input_location;
2529 /* Adds some ggc roots, and reserved words for c-parse.in. */
2532 current_function_decl = 0;
2534 gcc_obstack_init (&parser_obstack);
2536 /* Make the externals scope. */
2538 external_scope = current_scope;
2540 /* Declarations from c_common_nodes_and_builtins must not be associated
2541 with this input file, lest we get differences between using and not
2542 using preprocessed headers. */
2543 #ifdef USE_MAPPED_LOCATION
2544 input_location = BUILTINS_LOCATION;
2546 input_location.file = "<built-in>";
2547 input_location.line = 0;
2550 build_common_tree_nodes (flag_signed_char, false);
2552 c_common_nodes_and_builtins ();
2554 /* In C, comparisons and TRUTH_* expressions have type int. */
2555 truthvalue_type_node = integer_type_node;
2556 truthvalue_true_node = integer_one_node;
2557 truthvalue_false_node = integer_zero_node;
2559 /* Even in C99, which has a real boolean type. */
2560 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2561 boolean_type_node));
2563 endlink = void_list_node;
2564 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
2566 = build_function_type (ptr_type_node,
2567 tree_cons (NULL_TREE, ptr_type_node, endlink));
2569 input_location = save_loc;
2571 pedantic_lvalues = true;
2573 make_fname_decl = c_make_fname_decl;
2574 start_fname_decls ();
2577 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2578 decl, NAME is the initialization string and TYPE_DEP indicates whether
2579 NAME depended on the type of the function. As we don't yet implement
2580 delayed emission of static data, we mark the decl as emitted
2581 so it is not placed in the output. Anything using it must therefore pull
2582 out the STRING_CST initializer directly. FIXME. */
2585 c_make_fname_decl (tree id, int type_dep)
2587 const char *name = fname_as_string (type_dep);
2588 tree decl, type, init;
2589 size_t length = strlen (name);
2591 type = build_array_type
2592 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
2593 build_index_type (size_int (length)));
2595 decl = build_decl (VAR_DECL, id, type);
2597 TREE_STATIC (decl) = 1;
2598 TREE_READONLY (decl) = 1;
2599 DECL_ARTIFICIAL (decl) = 1;
2601 init = build_string (length + 1, name);
2602 free ((char *) name);
2603 TREE_TYPE (init) = type;
2604 DECL_INITIAL (decl) = init;
2606 TREE_USED (decl) = 1;
2608 if (current_function_decl)
2610 DECL_CONTEXT (decl) = current_function_decl;
2611 bind (id, decl, current_function_scope,
2612 /*invisible=*/false, /*nested=*/false);
2615 finish_decl (decl, init, NULL_TREE);
2620 /* Return a definition for a builtin function named NAME and whose data type
2621 is TYPE. TYPE should be a function type with argument types.
2622 FUNCTION_CODE tells later passes how to compile calls to this function.
2623 See tree.h for its possible values.
2625 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2626 the name to be called if we can't opencode the function. If
2627 ATTRS is nonzero, use that for the function's attribute list. */
2630 builtin_function (const char *name, tree type, int function_code,
2631 enum built_in_class cl, const char *library_name,
2634 tree id = get_identifier (name);
2635 tree decl = build_decl (FUNCTION_DECL, id, type);
2636 TREE_PUBLIC (decl) = 1;
2637 DECL_EXTERNAL (decl) = 1;
2638 DECL_LANG_SPECIFIC (decl) = GGC_CNEW (struct lang_decl);
2639 DECL_BUILT_IN_CLASS (decl) = cl;
2640 DECL_FUNCTION_CODE (decl) = function_code;
2642 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
2644 /* Should never be called on a symbol with a preexisting meaning. */
2645 gcc_assert (!I_SYMBOL_BINDING (id));
2647 bind (id, decl, external_scope, /*invisible=*/true, /*nested=*/false);
2649 /* Builtins in the implementation namespace are made visible without
2650 needing to be explicitly declared. See push_file_scope. */
2651 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
2653 TREE_CHAIN (decl) = visible_builtins;
2654 visible_builtins = decl;
2657 /* Possibly apply some default attributes to this built-in function. */
2659 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
2661 decl_attributes (&decl, NULL_TREE, 0);
2666 /* Called when a declaration is seen that contains no names to declare.
2667 If its type is a reference to a structure, union or enum inherited
2668 from a containing scope, shadow that tag name for the current scope
2669 with a forward reference.
2670 If its type defines a new named structure or union
2671 or defines an enum, it is valid but we need not do anything here.
2672 Otherwise, it is an error. */
2675 shadow_tag (const struct c_declspecs *declspecs)
2677 shadow_tag_warned (declspecs, 0);
2680 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
2683 shadow_tag_warned (const struct c_declspecs *declspecs, int warned)
2685 bool found_tag = false;
2687 if (declspecs->type && !declspecs->default_int_p && !declspecs->typedef_p)
2689 tree value = declspecs->type;
2690 enum tree_code code = TREE_CODE (value);
2692 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2693 /* Used to test also that TYPE_SIZE (value) != 0.
2694 That caused warning for `struct foo;' at top level in the file. */
2696 tree name = TYPE_NAME (value);
2703 if (warned != 1 && code != ENUMERAL_TYPE)
2704 /* Empty unnamed enum OK */
2706 pedwarn ("unnamed struct/union that defines no instances");
2710 else if (!declspecs->tag_defined_p
2711 && declspecs->storage_class != csc_none)
2714 pedwarn ("empty declaration with storage class specifier "
2715 "does not redeclare tag");
2717 pending_xref_error ();
2719 else if (!declspecs->tag_defined_p
2720 && (declspecs->const_p
2721 || declspecs->volatile_p
2722 || declspecs->restrict_p))
2725 pedwarn ("empty declaration with type qualifier "
2726 "does not redeclare tag");
2728 pending_xref_error ();
2732 pending_invalid_xref = 0;
2733 t = lookup_tag (code, name, 1);
2737 t = make_node (code);
2744 if (warned != 1 && !in_system_header)
2746 pedwarn ("useless type name in empty declaration");
2751 else if (warned != 1 && !in_system_header && declspecs->typedef_p)
2753 pedwarn ("useless type name in empty declaration");
2757 pending_invalid_xref = 0;
2759 if (declspecs->inline_p)
2761 error ("%<inline%> in empty declaration");
2765 if (current_scope == file_scope && declspecs->storage_class == csc_auto)
2767 error ("%<auto%> in file-scope empty declaration");
2771 if (current_scope == file_scope && declspecs->storage_class == csc_register)
2773 error ("%<register%> in file-scope empty declaration");
2777 if (!warned && !in_system_header && declspecs->storage_class != csc_none)
2779 warning ("useless storage class specifier in empty declaration");
2783 if (!warned && !in_system_header && declspecs->thread_p)
2785 warning ("useless %<__thread%> in empty declaration");
2789 if (!warned && !in_system_header && (declspecs->const_p
2790 || declspecs->volatile_p
2791 || declspecs->restrict_p))
2793 warning ("useless type qualifier in empty declaration");
2800 pedwarn ("empty declaration");
2805 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
2806 bits. SPECS represents declaration specifiers that the grammar
2807 only permits to contain type qualifiers and attributes. */
2810 quals_from_declspecs (const struct c_declspecs *specs)
2812 int quals = ((specs->const_p ? TYPE_QUAL_CONST : 0)
2813 | (specs->volatile_p ? TYPE_QUAL_VOLATILE : 0)
2814 | (specs->restrict_p ? TYPE_QUAL_RESTRICT : 0));
2815 gcc_assert (!specs->type
2816 && !specs->decl_attr
2817 && specs->typespec_word == cts_none
2818 && specs->storage_class == csc_none
2819 && !specs->typedef_p
2820 && !specs->explicit_signed_p
2821 && !specs->deprecated_p
2823 && !specs->long_long_p
2826 && !specs->unsigned_p
2827 && !specs->complex_p
2829 && !specs->thread_p);
2833 /* Construct an array declarator. EXPR is the expression inside [], or
2834 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
2835 to the pointer to which a parameter array is converted). STATIC_P is
2836 true if "static" is inside the [], false otherwise. VLA_UNSPEC_P
2837 is true if the array is [*], a VLA of unspecified length which is
2838 nevertheless a complete type (not currently implemented by GCC),
2839 false otherwise. The field for the contained declarator is left to be
2840 filled in by set_array_declarator_inner. */
2842 struct c_declarator *
2843 build_array_declarator (tree expr, struct c_declspecs *quals, bool static_p,
2846 struct c_declarator *declarator = XOBNEW (&parser_obstack,
2847 struct c_declarator);
2848 declarator->kind = cdk_array;
2849 declarator->declarator = 0;
2850 declarator->u.array.dimen = expr;
2853 declarator->u.array.attrs = quals->attrs;
2854 declarator->u.array.quals = quals_from_declspecs (quals);
2858 declarator->u.array.attrs = NULL_TREE;
2859 declarator->u.array.quals = 0;
2861 declarator->u.array.static_p = static_p;
2862 declarator->u.array.vla_unspec_p = vla_unspec_p;
2863 if (pedantic && !flag_isoc99)
2865 if (static_p || quals != NULL)
2866 pedwarn ("ISO C90 does not support %<static%> or type "
2867 "qualifiers in parameter array declarators");
2869 pedwarn ("ISO C90 does not support %<[*]%> array declarators");
2872 warning ("GCC does not yet properly implement %<[*]%> array declarators");
2876 /* Set the contained declarator of an array declarator. DECL is the
2877 declarator, as constructed by build_array_declarator; INNER is what
2878 appears on the left of the []. ABSTRACT_P is true if it is an
2879 abstract declarator, false otherwise; this is used to reject static
2880 and type qualifiers in abstract declarators, where they are not in
2881 the C99 grammar (subject to possible change in DR#289). */
2883 struct c_declarator *
2884 set_array_declarator_inner (struct c_declarator *decl,
2885 struct c_declarator *inner, bool abstract_p)
2887 decl->declarator = inner;
2888 if (abstract_p && (decl->u.array.quals != TYPE_UNQUALIFIED
2889 || decl->u.array.attrs != NULL_TREE
2890 || decl->u.array.static_p))
2891 error ("static or type qualifiers in abstract declarator");
2895 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
2898 groktypename (struct c_type_name *type_name)
2901 tree attrs = type_name->specs->attrs;
2903 type_name->specs->attrs = NULL_TREE;
2905 type = grokdeclarator (type_name->declarator, type_name->specs, TYPENAME,
2908 /* Apply attributes. */
2909 decl_attributes (&type, attrs, 0);
2914 /* Decode a declarator in an ordinary declaration or data definition.
2915 This is called as soon as the type information and variable name
2916 have been parsed, before parsing the initializer if any.
2917 Here we create the ..._DECL node, fill in its type,
2918 and put it on the list of decls for the current context.
2919 The ..._DECL node is returned as the value.
2921 Exception: for arrays where the length is not specified,
2922 the type is left null, to be filled in by `finish_decl'.
2924 Function definitions do not come here; they go to start_function
2925 instead. However, external and forward declarations of functions
2926 do go through here. Structure field declarations are done by
2927 grokfield and not through here. */
2930 start_decl (struct c_declarator *declarator, struct c_declspecs *declspecs,
2931 bool initialized, tree attributes)
2936 /* An object declared as __attribute__((deprecated)) suppresses
2937 warnings of uses of other deprecated items. */
2938 if (lookup_attribute ("deprecated", attributes))
2939 deprecated_state = DEPRECATED_SUPPRESS;
2941 decl = grokdeclarator (declarator, declspecs,
2942 NORMAL, initialized, NULL);
2946 deprecated_state = DEPRECATED_NORMAL;
2948 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
2949 && MAIN_NAME_P (DECL_NAME (decl)))
2950 warning ("%J%qD is usually a function", decl, decl);
2953 /* Is it valid for this decl to have an initializer at all?
2954 If not, set INITIALIZED to zero, which will indirectly
2955 tell 'finish_decl' to ignore the initializer once it is parsed. */
2956 switch (TREE_CODE (decl))
2959 error ("typedef %qD is initialized (use __typeof__ instead)", decl);
2964 error ("function %qD is initialized like a variable", decl);
2969 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
2970 error ("parameter %qD is initialized", decl);
2975 /* Don't allow initializations for incomplete types except for
2976 arrays which might be completed by the initialization. */
2978 /* This can happen if the array size is an undefined macro.
2979 We already gave a warning, so we don't need another one. */
2980 if (TREE_TYPE (decl) == error_mark_node)
2982 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
2984 /* A complete type is ok if size is fixed. */
2986 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
2987 || C_DECL_VARIABLE_SIZE (decl))
2989 error ("variable-sized object may not be initialized");
2993 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
2995 error ("variable %qD has initializer but incomplete type", decl);
2998 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
3000 error ("elements of array %qD have incomplete type", decl);
3003 else if (C_DECL_VARIABLE_SIZE (decl))
3005 /* Although C99 is unclear about whether incomplete arrays
3006 of VLAs themselves count as VLAs, it does not make
3007 sense to permit them to be initialized given that
3008 ordinary VLAs may not be initialized. */
3009 error ("variable-sized object may not be initialized");
3016 if (current_scope == file_scope)
3017 TREE_STATIC (decl) = 1;
3019 /* Tell 'pushdecl' this is an initialized decl
3020 even though we don't yet have the initializer expression.
3021 Also tell 'finish_decl' it may store the real initializer. */
3022 DECL_INITIAL (decl) = error_mark_node;
3025 /* If this is a function declaration, write a record describing it to the
3026 prototypes file (if requested). */
3028 if (TREE_CODE (decl) == FUNCTION_DECL)
3029 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3031 /* ANSI specifies that a tentative definition which is not merged with
3032 a non-tentative definition behaves exactly like a definition with an
3033 initializer equal to zero. (Section 3.7.2)
3035 -fno-common gives strict ANSI behavior, though this tends to break
3036 a large body of code that grew up without this rule.
3038 Thread-local variables are never common, since there's no entrenched
3039 body of code to break, and it allows more efficient variable references
3040 in the presence of dynamic linking. */
3042 if (TREE_CODE (decl) == VAR_DECL
3044 && TREE_PUBLIC (decl)
3045 && !DECL_THREAD_LOCAL (decl)
3047 DECL_COMMON (decl) = 1;
3049 /* Set attributes here so if duplicate decl, will have proper attributes. */
3050 decl_attributes (&decl, attributes, 0);
3052 if (TREE_CODE (decl) == FUNCTION_DECL
3053 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
3055 struct c_declarator *ce = declarator;
3057 if (ce->kind == cdk_pointer)
3058 ce = declarator->declarator;
3059 if (ce->kind == cdk_function)
3061 tree args = ce->u.arg_info->parms;
3062 for (; args; args = TREE_CHAIN (args))
3064 tree type = TREE_TYPE (args);
3065 if (type && INTEGRAL_TYPE_P (type)
3066 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
3067 DECL_ARG_TYPE (args) = integer_type_node;
3072 if (TREE_CODE (decl) == FUNCTION_DECL
3073 && DECL_DECLARED_INLINE_P (decl)
3074 && DECL_UNINLINABLE (decl)
3075 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
3076 warning ("%Jinline function %qD given attribute noinline", decl, decl);
3078 /* Add this decl to the current scope.
3079 TEM may equal DECL or it may be a previous decl of the same name. */
3080 tem = pushdecl (decl);
3082 if (initialized && DECL_EXTERNAL (tem))
3084 DECL_EXTERNAL (tem) = 0;
3085 TREE_STATIC (tem) = 1;
3091 /* Finish processing of a declaration;
3092 install its initial value.
3093 If the length of an array type is not known before,
3094 it must be determined now, from the initial value, or it is an error. */
3097 finish_decl (tree decl, tree init, tree asmspec_tree)
3099 tree type = TREE_TYPE (decl);
3100 int was_incomplete = (DECL_SIZE (decl) == 0);
3101 const char *asmspec = 0;
3103 /* If a name was specified, get the string. */
3104 if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
3105 && DECL_FILE_SCOPE_P (decl))
3106 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
3108 asmspec = TREE_STRING_POINTER (asmspec_tree);
3110 /* If `start_decl' didn't like having an initialization, ignore it now. */
3111 if (init != 0 && DECL_INITIAL (decl) == 0)
3114 /* Don't crash if parm is initialized. */
3115 if (TREE_CODE (decl) == PARM_DECL)
3119 store_init_value (decl, init);
3121 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
3122 || TREE_CODE (decl) == FUNCTION_DECL
3123 || TREE_CODE (decl) == FIELD_DECL))
3124 objc_check_decl (decl);
3126 /* Deduce size of array from initialization, if not already known. */
3127 if (TREE_CODE (type) == ARRAY_TYPE
3128 && TYPE_DOMAIN (type) == 0
3129 && TREE_CODE (decl) != TYPE_DECL)
3132 = (TREE_STATIC (decl)
3133 /* Even if pedantic, an external linkage array
3134 may have incomplete type at first. */
3135 ? pedantic && !TREE_PUBLIC (decl)
3136 : !DECL_EXTERNAL (decl));
3138 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3140 /* Get the completed type made by complete_array_type. */
3141 type = TREE_TYPE (decl);
3144 error ("%Jinitializer fails to determine size of %qD", decl, decl);
3146 else if (failure == 2)
3149 error ("%Jarray size missing in %qD", decl, decl);
3150 /* If a `static' var's size isn't known,
3151 make it extern as well as static, so it does not get
3153 If it is not `static', then do not mark extern;
3154 finish_incomplete_decl will give it a default size
3155 and it will get allocated. */
3156 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
3157 DECL_EXTERNAL (decl) = 1;
3160 /* TYPE_MAX_VALUE is always one less than the number of elements
3161 in the array, because we start counting at zero. Therefore,
3162 warn only if the value is less than zero. */
3163 else if (pedantic && TYPE_DOMAIN (type) != 0
3164 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3165 error ("%Jzero or negative size array %qD", decl, decl);
3167 layout_decl (decl, 0);
3170 if (TREE_CODE (decl) == VAR_DECL)
3172 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3173 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3174 layout_decl (decl, 0);
3176 if (DECL_SIZE (decl) == 0
3177 /* Don't give an error if we already gave one earlier. */
3178 && TREE_TYPE (decl) != error_mark_node
3179 && (TREE_STATIC (decl)
3180 /* A static variable with an incomplete type
3181 is an error if it is initialized.
3182 Also if it is not file scope.
3183 Otherwise, let it through, but if it is not `extern'
3184 then it may cause an error message later. */
3185 ? (DECL_INITIAL (decl) != 0
3186 || !DECL_FILE_SCOPE_P (decl))
3187 /* An automatic variable with an incomplete type
3189 : !DECL_EXTERNAL (decl)))
3191 error ("%Jstorage size of %qD isn%'t known", decl, decl);
3192 TREE_TYPE (decl) = error_mark_node;
3195 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3196 && DECL_SIZE (decl) != 0)
3198 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3199 constant_expression_warning (DECL_SIZE (decl));
3201 error ("%Jstorage size of %qD isn%'t constant", decl, decl);
3204 if (TREE_USED (type))
3205 TREE_USED (decl) = 1;
3208 /* If this is a function and an assembler name is specified, reset DECL_RTL
3209 so we can give it its new name. Also, update built_in_decls if it
3210 was a normal built-in. */
3211 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3213 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
3214 set_builtin_user_assembler_name (decl, asmspec);
3215 set_user_assembler_name (decl, asmspec);
3218 /* If #pragma weak was used, mark the decl weak now. */
3219 if (current_scope == file_scope)
3220 maybe_apply_pragma_weak (decl);
3222 /* If this is a variable definition, determine its ELF visibility. */
3223 if (TREE_CODE (decl) == VAR_DECL
3224 && TREE_STATIC (decl)
3225 && !DECL_EXTERNAL (decl))
3226 c_determine_visibility (decl);
3228 /* Output the assembler code and/or RTL code for variables and functions,
3229 unless the type is an undefined structure or union.
3230 If not, it will get done when the type is completed. */
3232 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3234 /* This is a no-op in c-lang.c or something real in objc-act.c. */
3235 if (c_dialect_objc ())
3236 objc_check_decl (decl);
3240 /* If this is not a static variable, issue a warning.
3241 It doesn't make any sense to give an ASMSPEC for an
3242 ordinary, non-register local variable. Historically,
3243 GCC has accepted -- but ignored -- the ASMSPEC in
3245 if (!DECL_FILE_SCOPE_P (decl)
3246 && TREE_CODE (decl) == VAR_DECL
3247 && !C_DECL_REGISTER (decl)
3248 && !TREE_STATIC (decl))
3249 warning ("%Jignoring asm-specifier for non-static local "
3250 "variable %qD", decl, decl);
3251 else if (C_DECL_REGISTER (decl))
3252 change_decl_assembler_name (decl, get_identifier (asmspec));
3254 set_user_assembler_name (decl, asmspec);
3257 if (DECL_FILE_SCOPE_P (decl))
3259 if (DECL_INITIAL (decl) == NULL_TREE
3260 || DECL_INITIAL (decl) == error_mark_node)
3261 /* Don't output anything
3262 when a tentative file-scope definition is seen.
3263 But at end of compilation, do output code for them. */
3264 DECL_DEFER_OUTPUT (decl) = 1;
3265 rest_of_decl_compilation (decl, true, 0);
3269 /* In conjunction with an ASMSPEC, the `register'
3270 keyword indicates that we should place the variable
3271 in a particular register. */
3272 if (asmspec && C_DECL_REGISTER (decl))
3274 DECL_HARD_REGISTER (decl) = 1;
3275 /* This cannot be done for a structure with volatile
3276 fields, on which DECL_REGISTER will have been
3278 if (!DECL_REGISTER (decl))
3279 error ("cannot put object with volatile field into register");
3282 if (TREE_CODE (decl) != FUNCTION_DECL)
3284 /* If we're building a variable sized type, and we might be
3285 reachable other than via the top of the current binding
3286 level, then create a new BIND_EXPR so that we deallocate
3287 the object at the right time. */
3288 /* Note that DECL_SIZE can be null due to errors. */
3289 if (DECL_SIZE (decl)
3290 && !TREE_CONSTANT (DECL_SIZE (decl))
3291 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list))
3294 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
3295 TREE_SIDE_EFFECTS (bind) = 1;
3297 BIND_EXPR_BODY (bind) = push_stmt_list ();
3299 add_stmt (build_stmt (DECL_EXPR, decl));
3304 if (!DECL_FILE_SCOPE_P (decl))
3306 /* Recompute the RTL of a local array now
3307 if it used to be an incomplete type. */
3309 && !TREE_STATIC (decl) && !DECL_EXTERNAL (decl))
3311 /* If we used it already as memory, it must stay in memory. */
3312 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3313 /* If it's still incomplete now, no init will save it. */
3314 if (DECL_SIZE (decl) == 0)
3315 DECL_INITIAL (decl) = 0;
3320 /* If this was marked 'used', be sure it will be output. */
3321 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
3322 mark_decl_referenced (decl);
3324 if (TREE_CODE (decl) == TYPE_DECL)
3326 if (!DECL_FILE_SCOPE_P (decl)
3327 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
3328 add_stmt (build_stmt (DECL_EXPR, decl));
3330 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0);
3333 /* At the end of a declaration, throw away any variable type sizes
3334 of types defined inside that declaration. There is no use
3335 computing them in the following function definition. */
3336 if (current_scope == file_scope)
3337 get_pending_sizes ();
3339 /* Install a cleanup (aka destructor) if one was given. */
3340 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
3342 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
3345 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
3346 tree cleanup_decl = lookup_name (cleanup_id);
3349 /* Build "cleanup(&decl)" for the destructor. */
3350 cleanup = build_unary_op (ADDR_EXPR, decl, 0);
3351 cleanup = build_tree_list (NULL_TREE, cleanup);
3352 cleanup = build_function_call (cleanup_decl, cleanup);
3354 /* Don't warn about decl unused; the cleanup uses it. */
3355 TREE_USED (decl) = 1;
3356 TREE_USED (cleanup_decl) = 1;
3358 /* Initialize EH, if we've been told to do so. */
3359 if (flag_exceptions && !c_eh_initialized_p)
3361 c_eh_initialized_p = true;
3362 eh_personality_libfunc
3363 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
3364 ? "__gcc_personality_sj0"
3365 : "__gcc_personality_v0");
3366 using_eh_for_cleanups ();
3369 push_cleanup (decl, cleanup, false);
3374 /* Given a parsed parameter declaration, decode it into a PARM_DECL. */
3377 grokparm (const struct c_parm *parm)
3379 tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false,
3382 decl_attributes (&decl, parm->attrs, 0);
3387 /* Given a parsed parameter declaration, decode it into a PARM_DECL
3388 and push that on the current scope. */
3391 push_parm_decl (const struct c_parm *parm)
3395 decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, NULL);
3396 decl_attributes (&decl, parm->attrs, 0);
3398 decl = pushdecl (decl);
3400 finish_decl (decl, NULL_TREE, NULL_TREE);
3403 /* Mark all the parameter declarations to date as forward decls.
3404 Also diagnose use of this extension. */
3407 mark_forward_parm_decls (void)
3409 struct c_binding *b;
3411 if (pedantic && !current_scope->warned_forward_parm_decls)
3413 pedwarn ("ISO C forbids forward parameter declarations");
3414 current_scope->warned_forward_parm_decls = true;
3417 for (b = current_scope->bindings; b; b = b->prev)
3418 if (TREE_CODE (b->decl) == PARM_DECL)
3419 TREE_ASM_WRITTEN (b->decl) = 1;
3422 static GTY(()) int compound_literal_number;
3424 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3425 literal, which may be an incomplete array type completed by the
3426 initializer; INIT is a CONSTRUCTOR that initializes the compound
3430 build_compound_literal (tree type, tree init)
3432 /* We do not use start_decl here because we have a type, not a declarator;
3433 and do not use finish_decl because the decl should be stored inside
3434 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
3439 if (type == error_mark_node)
3440 return error_mark_node;
3442 decl = build_decl (VAR_DECL, NULL_TREE, type);
3443 DECL_EXTERNAL (decl) = 0;
3444 TREE_PUBLIC (decl) = 0;
3445 TREE_STATIC (decl) = (current_scope == file_scope);
3446 DECL_CONTEXT (decl) = current_function_decl;
3447 TREE_USED (decl) = 1;
3448 TREE_TYPE (decl) = type;
3449 TREE_READONLY (decl) = TYPE_READONLY (type);
3450 store_init_value (decl, init);
3452 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3454 int failure = complete_array_type (type, DECL_INITIAL (decl), 1);
3456 gcc_assert (!failure);
3459 type = TREE_TYPE (decl);
3460 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3461 return error_mark_node;
3463 stmt = build_stmt (DECL_EXPR, decl);
3464 complit = build1 (COMPOUND_LITERAL_EXPR, TREE_TYPE (decl), stmt);
3465 TREE_SIDE_EFFECTS (complit) = 1;
3467 layout_decl (decl, 0);
3469 if (TREE_STATIC (decl))
3471 /* This decl needs a name for the assembler output. We also need
3472 a unique suffix to be added to the name. */
3475 ASM_FORMAT_PRIVATE_NAME (name, "__compound_literal",
3476 compound_literal_number);
3477 compound_literal_number++;
3478 DECL_NAME (decl) = get_identifier (name);
3479 DECL_DEFER_OUTPUT (decl) = 1;
3480 DECL_COMDAT (decl) = 1;
3481 DECL_ARTIFICIAL (decl) = 1;
3482 DECL_IGNORED_P (decl) = 1;
3484 rest_of_decl_compilation (decl, 1, 0);
3490 /* Make TYPE a complete type based on INITIAL_VALUE.
3491 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3492 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3495 complete_array_type (tree type, tree initial_value, int do_default)
3497 tree maxindex = NULL_TREE;
3502 /* Note MAXINDEX is really the maximum index,
3503 one less than the size. */
3504 if (TREE_CODE (initial_value) == STRING_CST)
3507 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3508 maxindex = build_int_cst (NULL_TREE,
3509 (TREE_STRING_LENGTH (initial_value)
3512 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3514 tree elts = CONSTRUCTOR_ELTS (initial_value);
3515 maxindex = build_int_cst (NULL_TREE, -1);
3516 for (; elts; elts = TREE_CHAIN (elts))
3518 if (TREE_PURPOSE (elts))
3519 maxindex = TREE_PURPOSE (elts);
3521 maxindex = fold (build2 (PLUS_EXPR, integer_type_node,
3522 maxindex, integer_one_node));
3527 /* Make an error message unless that happened already. */
3528 if (initial_value != error_mark_node)
3531 /* Prevent further error messages. */
3532 maxindex = build_int_cst (NULL_TREE, 0);
3539 maxindex = build_int_cst (NULL_TREE, 0);
3545 TYPE_DOMAIN (type) = build_index_type (maxindex);
3547 gcc_assert (TREE_TYPE (maxindex));
3550 /* Lay out the type now that we can get the real answer. */
3557 /* Determine whether TYPE is a structure with a flexible array member,
3558 or a union containing such a structure (possibly recursively). */
3561 flexible_array_type_p (tree type)
3564 switch (TREE_CODE (type))
3567 x = TYPE_FIELDS (type);
3570 while (TREE_CHAIN (x) != NULL_TREE)
3572 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
3573 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
3574 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
3575 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
3579 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
3581 if (flexible_array_type_p (TREE_TYPE (x)))
3590 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
3591 replacing with appropriate values if they are invalid. */
3593 check_bitfield_type_and_width (tree *type, tree *width, const char *orig_name)
3596 unsigned int max_width;
3597 unsigned HOST_WIDE_INT w;
3598 const char *name = orig_name ? orig_name: _("<anonymous>");
3601 STRIP_NOPS (*width);
3603 /* Detect and ignore out of range field width and process valid
3605 if (TREE_CODE (*width) != INTEGER_CST)
3607 error ("bit-field %qs width not an integer constant", name);
3608 *width = integer_one_node;
3612 constant_expression_warning (*width);
3613 if (tree_int_cst_sgn (*width) < 0)
3615 error ("negative width in bit-field %qs", name);
3616 *width = integer_one_node;
3618 else if (integer_zerop (*width) && orig_name)
3620 error ("zero width for bit-field %qs", name);
3621 *width = integer_one_node;
3625 /* Detect invalid bit-field type. */
3626 if (TREE_CODE (*type) != INTEGER_TYPE
3627 && TREE_CODE (*type) != BOOLEAN_TYPE
3628 && TREE_CODE (*type) != ENUMERAL_TYPE)
3630 error ("bit-field %qs has invalid type", name);
3631 *type = unsigned_type_node;
3634 type_mv = TYPE_MAIN_VARIANT (*type);
3636 && type_mv != integer_type_node
3637 && type_mv != unsigned_type_node
3638 && type_mv != boolean_type_node)
3639 pedwarn ("type of bit-field %qs is a GCC extension", name);
3641 if (type_mv == boolean_type_node)
3642 max_width = CHAR_TYPE_SIZE;
3644 max_width = TYPE_PRECISION (*type);
3646 if (0 < compare_tree_int (*width, max_width))
3648 error ("width of %qs exceeds its type", name);
3650 *width = build_int_cst (NULL_TREE, w);
3653 w = tree_low_cst (*width, 1);
3655 if (TREE_CODE (*type) == ENUMERAL_TYPE)
3657 struct lang_type *lt = TYPE_LANG_SPECIFIC (*type);
3659 || w < min_precision (lt->enum_min, TYPE_UNSIGNED (*type))
3660 || w < min_precision (lt->enum_max, TYPE_UNSIGNED (*type)))
3661 warning ("%qs is narrower than values of its type", name);
3665 /* Given declspecs and a declarator,
3666 determine the name and type of the object declared
3667 and construct a ..._DECL node for it.
3668 (In one case we can return a ..._TYPE node instead.
3669 For invalid input we sometimes return 0.)
3671 DECLSPECS is a c_declspecs structure for the declaration specifiers.
3673 DECL_CONTEXT says which syntactic context this declaration is in:
3674 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3675 FUNCDEF for a function definition. Like NORMAL but a few different
3676 error messages in each case. Return value may be zero meaning
3677 this definition is too screwy to try to parse.
3678 PARM for a parameter declaration (either within a function prototype
3679 or before a function body). Make a PARM_DECL, or return void_type_node.
3680 TYPENAME if for a typename (in a cast or sizeof).
3681 Don't make a DECL node; just return the ..._TYPE node.
3682 FIELD for a struct or union field; make a FIELD_DECL.
3683 INITIALIZED is true if the decl has an initializer.
3684 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
3685 representing the width of the bit-field.
3687 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3688 It may also be so in the PARM case, for a prototype where the
3689 argument type is specified but not the name.
3691 This function is where the complicated C meanings of `static'
3692 and `extern' are interpreted. */
3695 grokdeclarator (const struct c_declarator *declarator,
3696 struct c_declspecs *declspecs,
3697 enum decl_context decl_context, bool initialized, tree *width)
3699 tree type = declspecs->type;
3700 bool threadp = declspecs->thread_p;
3701 enum c_storage_class storage_class = declspecs->storage_class;
3705 int type_quals = TYPE_UNQUALIFIED;
3706 const char *name, *orig_name;
3707 tree typedef_type = 0;
3708 int funcdef_flag = 0;
3709 bool funcdef_syntax = false;
3710 int size_varies = 0;
3711 tree decl_attr = declspecs->decl_attr;
3712 int array_ptr_quals = TYPE_UNQUALIFIED;
3713 tree array_ptr_attrs = NULL_TREE;
3714 int array_parm_static = 0;
3715 tree returned_attrs = NULL_TREE;
3716 bool bitfield = width != NULL;
3718 struct c_arg_info *arg_info = 0;
3720 if (decl_context == FUNCDEF)
3721 funcdef_flag = 1, decl_context = NORMAL;
3723 /* Look inside a declarator for the name being declared
3724 and get it as a string, for an error message. */
3726 const struct c_declarator *decl = declarator;
3735 funcdef_syntax = (decl->kind == cdk_function);
3736 decl = decl->declarator;
3740 decl = decl->declarator;
3745 name = IDENTIFIER_POINTER (decl->u.id);
3757 /* A function definition's declarator must have the form of
3758 a function declarator. */
3760 if (funcdef_flag && !funcdef_syntax)
3763 /* If this looks like a function definition, make it one,
3764 even if it occurs where parms are expected.
3765 Then store_parm_decls will reject it and not use it as a parm. */
3766 if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag)
3767 decl_context = PARM;
3769 if (declspecs->deprecated_p && deprecated_state != DEPRECATED_SUPPRESS)
3770 warn_deprecated_use (declspecs->type);
3772 typedef_type = type;
3773 size_varies = C_TYPE_VARIABLE_SIZE (type);
3775 /* Diagnose defaulting to "int". */
3777 if (declspecs->default_int_p && !in_system_header)
3779 /* Issue a warning if this is an ISO C 99 program or if
3780 -Wreturn-type and this is a function, or if -Wimplicit;
3781 prefer the former warning since it is more explicit. */
3782 if ((warn_implicit_int || warn_return_type || flag_isoc99)
3784 warn_about_return_type = 1;
3785 else if (warn_implicit_int || flag_isoc99)
3786 pedwarn_c99 ("type defaults to %<int%> in declaration of %qs", name);
3789 /* Adjust the type if a bit-field is being declared,
3790 -funsigned-bitfields applied and the type is not explicitly
3792 if (bitfield && !flag_signed_bitfields && !declspecs->explicit_signed_p
3793 && TREE_CODE (type) == INTEGER_TYPE)
3794 type = c_common_unsigned_type (type);
3796 /* Figure out the type qualifiers for the declaration. There are
3797 two ways a declaration can become qualified. One is something
3798 like `const int i' where the `const' is explicit. Another is
3799 something like `typedef const int CI; CI i' where the type of the
3800 declaration contains the `const'. A third possibility is that
3801 there is a type qualifier on the element type of a typedefed
3802 array type, in which case we should extract that qualifier so
3803 that c_apply_type_quals_to_decls receives the full list of
3804 qualifiers to work with (C90 is not entirely clear about whether
3805 duplicate qualifiers should be diagnosed in this case, but it
3806 seems most appropriate to do so). */
3807 element_type = strip_array_types (type);
3808 constp = declspecs->const_p + TYPE_READONLY (element_type);
3809 restrictp = declspecs->restrict_p + TYPE_RESTRICT (element_type);
3810 volatilep = declspecs->volatile_p + TYPE_VOLATILE (element_type);
3811 if (pedantic && !flag_isoc99)
3814 pedwarn ("duplicate %<const%>");
3816 pedwarn ("duplicate %<restrict%>");
3818 pedwarn ("duplicate %<volatile%>");
3820 if (!flag_gen_aux_info && (TYPE_QUALS (type)))
3821 type = TYPE_MAIN_VARIANT (type);
3822 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
3823 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
3824 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
3826 /* Warn about storage classes that are invalid for certain
3827 kinds of declarations (parameters, typenames, etc.). */
3831 || storage_class == csc_auto
3832 || storage_class == csc_register
3833 || storage_class == csc_typedef))
3835 if (storage_class == csc_auto
3836 && (pedantic || current_scope == file_scope))
3837 pedwarn ("function definition declared %<auto%>");
3838 if (storage_class == csc_register)
3839 error ("function definition declared %<register%>");
3840 if (storage_class == csc_typedef)
3841 error ("function definition declared %<typedef%>");
3843 error ("function definition declared %<__thread%>");
3845 if (storage_class == csc_auto
3846 || storage_class == csc_register
3847 || storage_class == csc_typedef)
3848 storage_class = csc_none;
3850 else if (decl_context != NORMAL && (storage_class != csc_none || threadp))
3852 if (decl_context == PARM && storage_class == csc_register)
3856 switch (decl_context)
3859 error ("storage class specified for structure field %qs",
3863 error ("storage class specified for parameter %qs", name);
3866 error ("storage class specified for typename");
3869 storage_class = csc_none;
3873 else if (storage_class == csc_extern
3877 /* 'extern' with initialization is invalid if not at file scope. */
3878 if (current_scope == file_scope)
3879 warning ("%qs initialized and declared %<extern%>", name);
3881 error ("%qs has both %<extern%> and initializer", name);
3883 else if (current_scope == file_scope)
3885 if (storage_class == csc_auto)
3886 error ("file-scope declaration of %qs specifies %<auto%>", name);
3887 if (pedantic && storage_class == csc_register)
3888 pedwarn ("file-scope declaration of %qs specifies %<register%>", name);
3892 if (storage_class == csc_extern && funcdef_flag)
3893 error ("nested function %qs declared %<extern%>", name);
3894 else if (threadp && storage_class == csc_none)
3896 error ("function-scope %qs implicitly auto and declared "
3903 /* Now figure out the structure of the declarator proper.
3904 Descend through it, creating more complex types, until we reach
3905 the declared identifier (or NULL_TREE, in an absolute declarator). */
3907 while (declarator && declarator->kind != cdk_id)
3909 if (type == error_mark_node)
3911 declarator = declarator->declarator;
3915 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
3916 a cdk_pointer (for *...),
3917 a cdk_function (for ...(...)),
3918 a cdk_attrs (for nested attributes),
3919 or a cdk_id (for the name being declared
3920 or the place in an absolute declarator
3921 where the name was omitted).
3922 For the last case, we have just exited the loop.
3924 At this point, TYPE is the type of elements of an array,
3925 or for a function to return, or for a pointer to point to.
3926 After this sequence of ifs, TYPE is the type of the
3927 array or function or pointer, and DECLARATOR has had its
3928 outermost layer removed. */
3930 if (array_ptr_quals != TYPE_UNQUALIFIED
3931 || array_ptr_attrs != NULL_TREE
3932 || array_parm_static)
3934 /* Only the innermost declarator (making a parameter be of
3935 array type which is converted to pointer type)
3936 may have static or type qualifiers. */
3937 error ("static or type qualifiers in non-parameter array declarator");
3938 array_ptr_quals = TYPE_UNQUALIFIED;
3939 array_ptr_attrs = NULL_TREE;
3940 array_parm_static = 0;
3943 switch (declarator->kind)
3947 /* A declarator with embedded attributes. */
3948 tree attrs = declarator->u.attrs;
3949 const struct c_declarator *inner_decl;
3951 declarator = declarator->declarator;
3952 inner_decl = declarator;
3953 while (inner_decl->kind == cdk_attrs)
3954 inner_decl = inner_decl->declarator;
3955 if (inner_decl->kind == cdk_id)
3956 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
3957 else if (inner_decl->kind == cdk_function)
3958 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
3959 else if (inner_decl->kind == cdk_array)
3960 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
3961 returned_attrs = decl_attributes (&type,
3962 chainon (returned_attrs, attrs),
3968 tree itype = NULL_TREE;
3969 tree size = declarator->u.array.dimen;
3970 /* The index is a signed object `sizetype' bits wide. */
3971 tree index_type = c_common_signed_type (sizetype);
3973 array_ptr_quals = declarator->u.array.quals;
3974 array_ptr_attrs = declarator->u.array.attrs;
3975 array_parm_static = declarator->u.array.static_p;
3977 declarator = declarator->declarator;
3979 /* Check for some types that there cannot be arrays of. */
3981 if (VOID_TYPE_P (type))
3983 error ("declaration of %qs as array of voids", name);
3984 type = error_mark_node;
3987 if (TREE_CODE (type) == FUNCTION_TYPE)
3989 error ("declaration of %qs as array of functions", name);
3990 type = error_mark_node;
3993 if (pedantic && !in_system_header && flexible_array_type_p (type))
3994 pedwarn ("invalid use of structure with flexible array member");
3996 if (size == error_mark_node)
3997 type = error_mark_node;
3999 if (type == error_mark_node)
4002 /* If size was specified, set ITYPE to a range-type for
4003 that size. Otherwise, ITYPE remains null. finish_decl
4004 may figure it out from an initial value. */
4008 /* Strip NON_LVALUE_EXPRs since we aren't using as an
4010 STRIP_TYPE_NOPS (size);
4012 if (!INTEGRAL_TYPE_P (TREE_TYPE (size)))
4014 error ("size of array %qs has non-integer type", name);
4015 size = integer_one_node;
4018 if (pedantic && integer_zerop (size))
4019 pedwarn ("ISO C forbids zero-size array %qs", name);
4021 if (TREE_CODE (size) == INTEGER_CST)
4023 constant_expression_warning (size);
4024 if (tree_int_cst_sgn (size) < 0)
4026 error ("size of array %qs is negative", name);
4027 size = integer_one_node;
4032 /* Make sure the array size remains visibly
4033 nonconstant even if it is (eg) a const variable
4034 with known value. */
4037 if (!flag_isoc99 && pedantic)
4039 if (TREE_CONSTANT (size))
4040 pedwarn ("ISO C90 forbids array %qs whose size "
4041 "can%'t be evaluated",
4044 pedwarn ("ISO C90 forbids variable-size array %qs",
4049 if (integer_zerop (size))
4051 /* A zero-length array cannot be represented with
4052 an unsigned index type, which is what we'll
4053 get with build_index_type. Create an
4054 open-ended range instead. */
4055 itype = build_range_type (sizetype, size, NULL_TREE);
4059 /* Arrange for the SAVE_EXPR on the inside of the
4060 MINUS_EXPR, which allows the -1 to get folded
4061 with the +1 that happens when building TYPE_SIZE. */
4063 size = variable_size (size);
4065 /* Compute the maximum valid index, that is, size
4066 - 1. Do the calculation in index_type, so that
4067 if it is a variable the computations will be
4068 done in the proper mode. */
4069 itype = fold (build2 (MINUS_EXPR, index_type,
4070 convert (index_type, size),
4071 convert (index_type,
4074 /* If that overflowed, the array is too big. ???
4075 While a size of INT_MAX+1 technically shouldn't
4076 cause an overflow (because we subtract 1), the
4077 overflow is recorded during the conversion to
4078 index_type, before the subtraction. Handling
4079 this case seems like an unnecessary
4081 if (TREE_OVERFLOW (itype))
4083 error ("size of array %qs is too large", name);
4084 type = error_mark_node;
4088 itype = build_index_type (itype);
4091 else if (decl_context == FIELD)
4093 if (pedantic && !flag_isoc99 && !in_system_header)
4094 pedwarn ("ISO C90 does not support flexible array members");
4096 /* ISO C99 Flexible array members are effectively
4097 identical to GCC's zero-length array extension. */
4098 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4101 /* If pedantic, complain about arrays of incomplete types. */
4102 if (pedantic && !COMPLETE_TYPE_P (type))
4103 pedwarn ("array type has incomplete element type");
4105 /* Build the array type itself, then merge any constancy
4106 or volatility into the target type. We must do it in
4107 this order to ensure that the TYPE_MAIN_VARIANT field
4108 of the array type is set correctly. */
4109 type = build_array_type (type, itype);
4111 type = c_build_qualified_type (type, type_quals);
4114 C_TYPE_VARIABLE_SIZE (type) = 1;
4116 /* The GCC extension for zero-length arrays differs from
4117 ISO flexible array members in that sizeof yields
4119 if (size && integer_zerop (size))
4121 TYPE_SIZE (type) = bitsize_zero_node;
4122 TYPE_SIZE_UNIT (type) = size_zero_node;
4125 if (decl_context != PARM
4126 && (array_ptr_quals != TYPE_UNQUALIFIED
4127 || array_ptr_attrs != NULL_TREE
4128 || array_parm_static))
4130 error ("static or type qualifiers in non-parameter array declarator");
4131 array_ptr_quals = TYPE_UNQUALIFIED;
4132 array_ptr_attrs = NULL_TREE;
4133 array_parm_static = 0;
4139 /* Say it's a definition only for the declarator closest
4140 to the identifier, apart possibly from some
4142 bool really_funcdef = false;
4146 const struct c_declarator *t = declarator->declarator;
4147 while (t->kind == cdk_attrs)
4149 really_funcdef = (t->kind == cdk_id);
4152 /* Declaring a function type. Make sure we have a valid
4153 type for the function to return. */
4154 if (type == error_mark_node)
4159 /* Warn about some types functions can't return. */
4160 if (TREE_CODE (type) == FUNCTION_TYPE)
4162 error ("%qs declared as function returning a function", name);
4163 type = integer_type_node;
4165 if (TREE_CODE (type) == ARRAY_TYPE)
4167 error ("%qs declared as function returning an array", name);
4168 type = integer_type_node;
4171 /* Construct the function type and go to the next
4172 inner layer of declarator. */
4173 arg_info = declarator->u.arg_info;
4174 arg_types = grokparms (arg_info, really_funcdef);
4176 /* Type qualifiers before the return type of the function
4177 qualify the return type, not the function type. */
4180 /* Type qualifiers on a function return type are
4181 normally permitted by the standard but have no
4182 effect, so give a warning at -Wreturn-type.
4183 Qualifiers on a void return type are banned on
4184 function definitions in ISO C; GCC used to used
4185 them for noreturn functions. */
4186 if (VOID_TYPE_P (type) && really_funcdef)
4187 pedwarn ("function definition has qualified void return type");
4188 else if (warn_return_type)
4189 warning ("type qualifiers ignored on function return type");
4191 type = c_build_qualified_type (type, type_quals);
4193 type_quals = TYPE_UNQUALIFIED;
4195 type = build_function_type (type, arg_types);
4196 declarator = declarator->declarator;
4198 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4199 the formal parameter list of this FUNCTION_TYPE to point to
4200 the FUNCTION_TYPE node itself. */
4204 for (link = arg_info->tags;
4206 link = TREE_CHAIN (link))
4207 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4213 /* Merge any constancy or volatility into the target type
4216 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4218 pedwarn ("ISO C forbids qualified function types");
4220 type = c_build_qualified_type (type, type_quals);
4223 type = build_pointer_type (type);
4225 /* Process type qualifiers (such as const or volatile)
4226 that were given inside the `*'. */
4227 type_quals = declarator->u.pointer_quals;
4229 declarator = declarator->declarator;
4237 /* Now TYPE has the actual type. */
4239 /* Check the type and width of a bit-field. */
4241 check_bitfield_type_and_width (&type, width, orig_name);
4243 /* Did array size calculations overflow? */
4245 if (TREE_CODE (type) == ARRAY_TYPE
4246 && COMPLETE_TYPE_P (type)
4247 && TREE_OVERFLOW (TYPE_SIZE (type)))
4249 error ("size of array %qs is too large", name);
4250 /* If we proceed with the array type as it is, we'll eventually
4251 crash in tree_low_cst(). */
4252 type = error_mark_node;
4255 /* If this is declaring a typedef name, return a TYPE_DECL. */
4257 if (storage_class == csc_typedef)
4260 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4262 pedwarn ("ISO C forbids qualified function types");
4264 type = c_build_qualified_type (type, type_quals);
4265 decl = build_decl (TYPE_DECL, declarator->u.id, type);
4266 if (declspecs->explicit_signed_p)
4267 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4268 decl_attributes (&decl, returned_attrs, 0);
4269 if (declspecs->inline_p)
4270 pedwarn ("%Jtypedef %qD declared %<inline%>", decl, decl);
4274 /* Detect the case of an array type of unspecified size
4275 which came, as such, direct from a typedef name.
4276 We must copy the type, so that each identifier gets
4277 a distinct type, so that each identifier's size can be
4278 controlled separately by its own initializer. */
4280 if (type != 0 && typedef_type != 0
4281 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4282 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4284 type = build_array_type (TREE_TYPE (type), 0);
4286 C_TYPE_VARIABLE_SIZE (type) = 1;
4289 /* If this is a type name (such as, in a cast or sizeof),
4290 compute the type and return it now. */
4292 if (decl_context == TYPENAME)
4294 /* Note that the grammar rejects storage classes in typenames
4296 gcc_assert (storage_class == csc_none && !threadp
4297 && !declspecs->inline_p);
4298 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4300 pedwarn ("ISO C forbids const or volatile function types");
4302 type = c_build_qualified_type (type, type_quals);
4303 decl_attributes (&type, returned_attrs, 0);
4307 /* Aside from typedefs and type names (handle above),
4308 `void' at top level (not within pointer)
4309 is allowed only in public variables.
4310 We don't complain about parms either, but that is because
4311 a better error message can be made later. */
4313 if (VOID_TYPE_P (type) && decl_context != PARM
4314 && !((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4315 && (storage_class == csc_extern
4316 || (current_scope == file_scope
4317 && !(storage_class == csc_static
4318 || storage_class == csc_register)))))
4320 error ("variable or field %qs declared void", name);
4321 type = integer_type_node;
4324 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4325 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4330 if (decl_context == PARM)
4332 tree type_as_written;
4335 /* A parameter declared as an array of T is really a pointer to T.
4336 One declared as a function is really a pointer to a function. */
4338 if (TREE_CODE (type) == ARRAY_TYPE)
4340 /* Transfer const-ness of array into that of type pointed to. */
4341 type = TREE_TYPE (type);
4343 type = c_build_qualified_type (type, type_quals);
4344 type = build_pointer_type (type);
4345 type_quals = array_ptr_quals;
4347 /* We don't yet implement attributes in this context. */
4348 if (array_ptr_attrs != NULL_TREE)
4349 warning ("attributes in parameter array declarator ignored");
4353 else if (TREE_CODE (type) == FUNCTION_TYPE)
4355 if (pedantic && type_quals)
4356 pedwarn ("ISO C forbids qualified function types");
4358 type = c_build_qualified_type (type, type_quals);
4359 type = build_pointer_type (type);
4360 type_quals = TYPE_UNQUALIFIED;
4362 else if (type_quals)
4363 type = c_build_qualified_type (type, type_quals);
4365 type_as_written = type;
4367 decl = build_decl (PARM_DECL, declarator->u.id, type);
4369 C_DECL_VARIABLE_SIZE (decl) = 1;
4371 /* Compute the type actually passed in the parmlist,
4372 for the case where there is no prototype.
4373 (For example, shorts and chars are passed as ints.)
4374 When there is a prototype, this is overridden later. */
4376 if (type == error_mark_node)
4377 promoted_type = type;
4379 promoted_type = c_type_promotes_to (type);
4381 DECL_ARG_TYPE (decl) = promoted_type;
4382 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4383 if (declspecs->inline_p)
4384 pedwarn ("%Jparameter %qD declared %<inline%>", decl, decl);
4386 else if (decl_context == FIELD)
4388 /* Note that the grammar rejects storage classes in typenames
4390 gcc_assert (storage_class == csc_none && !threadp
4391 && !declspecs->inline_p);
4393 /* Structure field. It may not be a function. */
4395 if (TREE_CODE (type) == FUNCTION_TYPE)
4397 error ("field %qs declared as a function", name);
4398 type = build_pointer_type (type);
4400 else if (TREE_CODE (type) != ERROR_MARK
4401 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4403 error ("field %qs has incomplete type", name);
4404 type = error_mark_node;
4406 /* Move type qualifiers down to element of an array. */
4407 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4408 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4410 TYPE_DOMAIN (type));
4411 decl = build_decl (FIELD_DECL, declarator->u.id, type);
4412 DECL_NONADDRESSABLE_P (decl) = bitfield;
4415 C_DECL_VARIABLE_SIZE (decl) = 1;
4417 else if (TREE_CODE (type) == FUNCTION_TYPE)
4419 if (storage_class == csc_register || threadp)
4421 error ("invalid storage class for function %qs", name);
4423 else if (current_scope != file_scope)
4425 /* Function declaration not at file scope. Storage
4426 classes other than `extern' are not allowed, C99
4427 6.7.1p5, and `extern' makes no difference. However,
4428 GCC allows 'auto', perhaps with 'inline', to support
4429 nested functions. */
4430 if (storage_class == csc_auto)
4433 pedwarn ("invalid storage class for function %qs", name);
4435 else if (storage_class == csc_static)
4437 error ("invalid storage class for function %qs", name);
4439 storage_class = declspecs->storage_class = csc_none;
4445 decl = build_decl (FUNCTION_DECL, declarator->u.id, type);
4446 decl = build_decl_attribute_variant (decl, decl_attr);
4448 DECL_LANG_SPECIFIC (decl) = GGC_CNEW (struct lang_decl);
4450 if (pedantic && type_quals && !DECL_IN_SYSTEM_HEADER (decl))
4451 pedwarn ("ISO C forbids qualified function types");
4453 /* GNU C interprets a volatile-qualified function type to indicate
4454 that the function does not return. */
4455 if ((type_quals & TYPE_QUAL_VOLATILE)
4456 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4457 warning ("%<noreturn%> function returns non-void value");
4459 /* Every function declaration is an external reference
4460 (DECL_EXTERNAL) except for those which are not at file
4461 scope and are explicitly declared "auto". This is
4462 forbidden by standard C (C99 6.7.1p5) and is interpreted by
4463 GCC to signify a forward declaration of a nested function. */
4464 if (storage_class == csc_auto && current_scope != file_scope)
4465 DECL_EXTERNAL (decl) = 0;
4467 DECL_EXTERNAL (decl) = 1;
4469 /* Record absence of global scope for `static' or `auto'. */
4471 = !(storage_class == csc_static || storage_class == csc_auto);
4473 /* For a function definition, record the argument information
4474 block where store_parm_decls will look for it. */
4476 current_function_arg_info = arg_info;
4478 if (declspecs->default_int_p)
4479 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4481 /* Record presence of `inline', if it is reasonable. */
4482 if (flag_hosted && MAIN_NAME_P (declarator->u.id))
4484 if (declspecs->inline_p)
4485 pedwarn ("cannot inline function %<main%>");
4487 else if (declspecs->inline_p)
4489 /* Record that the function is declared `inline'. */
4490 DECL_DECLARED_INLINE_P (decl) = 1;
4492 /* Do not mark bare declarations as DECL_INLINE. Doing so
4493 in the presence of multiple declarations can result in
4494 the abstract origin pointing between the declarations,
4495 which will confuse dwarf2out. */
4498 DECL_INLINE (decl) = 1;
4499 if (storage_class == csc_extern)
4500 current_extern_inline = 1;
4503 /* If -finline-functions, assume it can be inlined. This does
4504 two things: let the function be deferred until it is actually
4505 needed, and let dwarf2 know that the function is inlinable. */
4506 else if (flag_inline_trees == 2 && initialized)
4507 DECL_INLINE (decl) = 1;
4511 /* It's a variable. */
4512 /* An uninitialized decl with `extern' is a reference. */
4513 int extern_ref = !initialized && storage_class == csc_extern;
4515 /* Move type qualifiers down to element of an array. */
4516 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4518 int saved_align = TYPE_ALIGN(type);
4519 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4521 TYPE_DOMAIN (type));
4522 TYPE_ALIGN (type) = saved_align;
4524 else if (type_quals)
4525 type = c_build_qualified_type (type, type_quals);
4527 /* C99 6.2.2p7: It is invalid (compile-time undefined
4528 behavior) to create an 'extern' declaration for a
4529 variable if there is a global declaration that is
4530 'static' and the global declaration is not visible.
4531 (If the static declaration _is_ currently visible,
4532 the 'extern' declaration is taken to refer to that decl.) */
4533 if (extern_ref && current_scope != file_scope)
4535 tree global_decl = identifier_global_value (declarator->u.id);
4536 tree visible_decl = lookup_name (declarator->u.id);
4539 && global_decl != visible_decl
4540 && TREE_CODE (global_decl) == VAR_DECL
4541 && !TREE_PUBLIC (global_decl))
4542 error ("variable previously declared %<static%> redeclared "
4546 decl = build_decl (VAR_DECL, declarator->u.id, type);
4548 C_DECL_VARIABLE_SIZE (decl) = 1;
4550 if (declspecs->inline_p)
4551 pedwarn ("%Jvariable %qD declared %<inline%>", decl, decl);
4553 /* At file scope, an initialized extern declaration may follow
4554 a static declaration. In that case, DECL_EXTERNAL will be
4555 reset later in start_decl. */
4556 DECL_EXTERNAL (decl) = (storage_class == csc_extern);
4558 /* At file scope, the presence of a `static' or `register' storage
4559 class specifier, or the absence of all storage class specifiers
4560 makes this declaration a definition (perhaps tentative). Also,
4561 the absence of both `static' and `register' makes it public. */
4562 if (current_scope == file_scope)
4564 TREE_PUBLIC (decl) = !(storage_class == csc_static
4565 || storage_class == csc_register);
4566 TREE_STATIC (decl) = !extern_ref;
4568 /* Not at file scope, only `static' makes a static definition. */
4571 TREE_STATIC (decl) = (storage_class == csc_static);
4572 TREE_PUBLIC (decl) = extern_ref;
4577 if (targetm.have_tls)
4578 DECL_THREAD_LOCAL (decl) = 1;
4580 /* A mere warning is sure to result in improper semantics
4581 at runtime. Don't bother to allow this to compile. */
4582 error ("thread-local storage not supported for this target");
4586 /* Record `register' declaration for warnings on &
4587 and in case doing stupid register allocation. */
4589 if (storage_class == csc_register)
4591 C_DECL_REGISTER (decl) = 1;
4592 DECL_REGISTER (decl) = 1;
4595 /* Record constancy and volatility. */
4596 c_apply_type_quals_to_decl (type_quals, decl);
4598 /* If a type has volatile components, it should be stored in memory.
4599 Otherwise, the fact that those components are volatile
4600 will be ignored, and would even crash the compiler. */
4601 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4603 /* It is not an error for a structure with volatile fields to
4604 be declared register, but reset DECL_REGISTER since it
4605 cannot actually go in a register. */
4606 int was_reg = C_DECL_REGISTER (decl);
4607 C_DECL_REGISTER (decl) = 0;
4608 DECL_REGISTER (decl) = 0;
4609 c_mark_addressable (decl);
4610 C_DECL_REGISTER (decl) = was_reg;
4613 /* This is the earliest point at which we might know the assembler
4614 name of a variable. Thus, if it's known before this, die horribly. */
4615 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl));
4617 decl_attributes (&decl, returned_attrs, 0);
4623 /* Decode the parameter-list info for a function type or function definition.
4624 The argument is the value returned by `get_parm_info' (or made in parse.y
4625 if there is an identifier list instead of a parameter decl list).
4626 These two functions are separate because when a function returns
4627 or receives functions then each is called multiple times but the order
4628 of calls is different. The last call to `grokparms' is always the one
4629 that contains the formal parameter names of a function definition.
4631 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4633 FUNCDEF_FLAG is true for a function definition, false for
4634 a mere declaration. A nonempty identifier-list gets an error message
4635 when FUNCDEF_FLAG is false. */
4638 grokparms (struct c_arg_info *arg_info, bool funcdef_flag)
4640 tree arg_types = arg_info->types;
4642 if (warn_strict_prototypes && arg_types == 0 && !funcdef_flag
4643 && !in_system_header)
4644 warning ("function declaration isn%'t a prototype");
4646 if (arg_types == error_mark_node)
4647 return 0; /* don't set TYPE_ARG_TYPES in this case */
4649 else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE)
4652 pedwarn ("parameter names (without types) in function declaration");
4654 arg_info->parms = arg_info->types;
4655 arg_info->types = 0;
4660 tree parm, type, typelt;
4661 unsigned int parmno;
4663 /* If there is a parameter of incomplete type in a definition,
4664 this is an error. In a declaration this is valid, and a
4665 struct or union type may be completed later, before any calls
4666 or definition of the function. In the case where the tag was
4667 first declared within the parameter list, a warning has
4668 already been given. If a parameter has void type, then
4669 however the function cannot be defined or called, so
4672 for (parm = arg_info->parms, typelt = arg_types, parmno = 1;
4674 parm = TREE_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++)
4676 type = TREE_VALUE (typelt);
4677 if (type == error_mark_node)
4680 if (!COMPLETE_TYPE_P (type))
4684 if (DECL_NAME (parm))
4685 error ("%Jparameter %u (%qD) has incomplete type",
4686 parm, parmno, parm);
4688 error ("%Jparameter %u has incomplete type",
4691 TREE_VALUE (typelt) = error_mark_node;
4692 TREE_TYPE (parm) = error_mark_node;
4694 else if (VOID_TYPE_P (type))
4696 if (DECL_NAME (parm))
4697 warning ("%Jparameter %u (%qD) has void type",
4698 parm, parmno, parm);
4700 warning ("%Jparameter %u has void type",
4709 /* Take apart the current scope and return a c_arg_info structure with
4710 info on a parameter list just parsed.
4712 This structure is later fed to 'grokparms' and 'store_parm_decls'.
4714 ELLIPSIS being true means the argument list ended in '...' so don't
4715 append a sentinel (void_list_node) to the end of the type-list. */
4718 get_parm_info (bool ellipsis)
4720 struct c_binding *b = current_scope->bindings;
4721 struct c_arg_info *arg_info = XOBNEW (&parser_obstack,
4728 static bool explained_incomplete_types = false;
4729 bool gave_void_only_once_err = false;
4731 arg_info->parms = 0;
4733 arg_info->types = 0;
4734 arg_info->others = 0;
4736 /* The bindings in this scope must not get put into a block.
4737 We will take care of deleting the binding nodes. */
4738 current_scope->bindings = 0;
4740 /* This function is only called if there was *something* on the
4744 /* A parameter list consisting solely of 'void' indicates that the
4745 function takes no arguments. But if the 'void' is qualified
4746 (by 'const' or 'volatile'), or has a storage class specifier
4747 ('register'), then the behavior is undefined; issue an error.
4748 Typedefs for 'void' are OK (see DR#157). */
4749 if (b->prev == 0 /* one binding */
4750 && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */
4751 && !DECL_NAME (b->decl) /* anonymous */
4752 && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */
4754 if (TREE_THIS_VOLATILE (b->decl)
4755 || TREE_READONLY (b->decl)
4756 || C_DECL_REGISTER (b->decl))
4757 error ("%<void%> as only parameter may not be qualified");
4759 /* There cannot be an ellipsis. */
4761 error ("%<void%> must be the only parameter");
4763 arg_info->types = void_list_node;
4768 types = void_list_node;
4770 /* Break up the bindings list into parms, tags, types, and others;
4771 apply sanity checks; purge the name-to-decl bindings. */
4774 tree decl = b->decl;
4775 tree type = TREE_TYPE (decl);
4776 const char *keyword;
4778 switch (TREE_CODE (decl))
4783 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
4784 I_SYMBOL_BINDING (b->id) = b->shadowed;
4787 /* Check for forward decls that never got their actual decl. */
4788 if (TREE_ASM_WRITTEN (decl))
4789 error ("%Jparameter %qD has just a forward declaration",
4791 /* Check for (..., void, ...) and issue an error. */
4792 else if (VOID_TYPE_P (type) && !DECL_NAME (decl))
4794 if (!gave_void_only_once_err)
4796 error ("%<void%> must be the only parameter");
4797 gave_void_only_once_err = true;
4802 /* Valid parameter, add it to the list. */
4803 TREE_CHAIN (decl) = parms;
4806 /* Since there is a prototype, args are passed in their
4807 declared types. The back end may override this later. */
4808 DECL_ARG_TYPE (decl) = type;
4809 types = tree_cons (0, type, types);
4813 case ENUMERAL_TYPE: keyword = "enum"; goto tag;
4814 case UNION_TYPE: keyword = "union"; goto tag;
4815 case RECORD_TYPE: keyword = "struct"; goto tag;
4817 /* Types may not have tag-names, in which case the type
4818 appears in the bindings list with b->id NULL. */
4821 gcc_assert (I_TAG_BINDING (b->id) == b);
4822 I_TAG_BINDING (b->id) = b->shadowed;
4825 /* Warn about any struct, union or enum tags defined in a
4826 parameter list. The scope of such types is limited to
4827 the parameter list, which is rarely if ever desirable
4828 (it's impossible to call such a function with type-
4829 correct arguments). An anonymous union parm type is
4830 meaningful as a GNU extension, so don't warn for that. */
4831 if (TREE_CODE (decl) != UNION_TYPE || b->id != 0)
4834 /* The %s will be one of 'struct', 'union', or 'enum'. */
4835 warning ("%<%s %E%> declared inside parameter list",
4838 /* The %s will be one of 'struct', 'union', or 'enum'. */
4839 warning ("anonymous %s declared inside parameter list",
4842 if (!explained_incomplete_types)
4844 warning ("its scope is only this definition or declaration,"
4845 " which is probably not what you want");
4846 explained_incomplete_types = true;
4850 tags = tree_cons (b->id, decl, tags);
4856 /* CONST_DECLs appear here when we have an embedded enum,
4857 and TYPE_DECLs appear here when we have an embedded struct
4858 or union. No warnings for this - we already warned about the
4859 type itself. FUNCTION_DECLs appear when there is an implicit
4860 function declaration in the parameter list. */
4862 TREE_CHAIN (decl) = others;
4867 /* error_mark_node appears here when we have an undeclared
4868 variable. Just throw it away. */
4871 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
4872 I_SYMBOL_BINDING (b->id) = b->shadowed;
4876 /* Other things that might be encountered. */
4883 b = free_binding_and_advance (b);
4886 arg_info->parms = parms;
4887 arg_info->tags = tags;
4888 arg_info->types = types;
4889 arg_info->others = others;
4893 /* Get the struct, enum or union (CODE says which) with tag NAME.
4894 Define the tag as a forward-reference if it is not defined.
4895 Return a c_typespec structure for the type specifier. */
4898 parser_xref_tag (enum tree_code code, tree name)
4900 struct c_typespec ret;
4901 /* If a cross reference is requested, look up the type
4902 already defined for this tag and return it. */
4904 tree ref = lookup_tag (code, name, 0);
4905 /* If this is the right type of tag, return what we found.
4906 (This reference will be shadowed by shadow_tag later if appropriate.)
4907 If this is the wrong type of tag, do not return it. If it was the
4908 wrong type in the same scope, we will have had an error
4909 message already; if in a different scope and declaring
4910 a name, pending_xref_error will give an error message; but if in a
4911 different scope and not declaring a name, this tag should
4912 shadow the previous declaration of a different type of tag, and
4913 this would not work properly if we return the reference found.
4914 (For example, with "struct foo" in an outer scope, "union foo;"
4915 must shadow that tag with a new one of union type.) */
4916 ret.kind = (ref ? ctsk_tagref : ctsk_tagfirstref);
4917 if (ref && TREE_CODE (ref) == code)
4923 /* If no such tag is yet defined, create a forward-reference node
4924 and record it as the "definition".
4925 When a real declaration of this type is found,
4926 the forward-reference will be altered into a real type. */
4928 ref = make_node (code);
4929 if (code == ENUMERAL_TYPE)
4931 /* Give the type a default layout like unsigned int
4932 to avoid crashing if it does not get defined. */
4933 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
4934 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
4935 TYPE_USER_ALIGN (ref) = 0;
4936 TYPE_UNSIGNED (ref) = 1;
4937 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
4938 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
4939 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
4942 pushtag (name, ref);
4948 /* Get the struct, enum or union (CODE says which) with tag NAME.
4949 Define the tag as a forward-reference if it is not defined.
4950 Return a tree for the type. */
4953 xref_tag (enum tree_code code, tree name)
4955 return parser_xref_tag (code, name).spec;
4958 /* Make sure that the tag NAME is defined *in the current scope*
4959 at least as a forward reference.
4960 CODE says which kind of tag NAME ought to be. */
4963 start_struct (enum tree_code code, tree name)
4965 /* If there is already a tag defined at this scope
4966 (as a forward reference), just return it. */
4971 ref = lookup_tag (code, name, 1);
4972 if (ref && TREE_CODE (ref) == code)
4974 if (TYPE_SIZE (ref))
4976 if (code == UNION_TYPE)
4977 error ("redefinition of %<union %s%>", IDENTIFIER_POINTER (name));
4979 error ("redefinition of %<struct %s%>", IDENTIFIER_POINTER (name));
4981 else if (C_TYPE_BEING_DEFINED (ref))
4983 if (code == UNION_TYPE)
4984 error ("nested redefinition of %<union %s%>",
4985 IDENTIFIER_POINTER (name));
4987 error ("nested redefinition of %<struct %s%>",
4988 IDENTIFIER_POINTER (name));
4993 /* Otherwise create a forward-reference just so the tag is in scope. */
4995 ref = make_node (code);
4996 pushtag (name, ref);
4999 C_TYPE_BEING_DEFINED (ref) = 1;
5000 TYPE_PACKED (ref) = flag_pack_struct;
5004 /* Process the specs, declarator and width (NULL if omitted)
5005 of a structure component, returning a FIELD_DECL node.
5006 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
5008 This is done during the parsing of the struct declaration.
5009 The FIELD_DECL nodes are chained together and the lot of them
5010 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5013 grokfield (struct c_declarator *declarator, struct c_declspecs *declspecs,
5018 if (declarator->kind == cdk_id && declarator->u.id == NULL_TREE
5019 && width == NULL_TREE)
5021 /* This is an unnamed decl.
5023 If we have something of the form "union { list } ;" then this
5024 is the anonymous union extension. Similarly for struct.
5026 If this is something of the form "struct foo;", then
5027 If MS extensions are enabled, this is handled as an
5029 Otherwise this is a forward declaration of a structure tag.
5031 If this is something of the form "foo;" and foo is a TYPE_DECL, then
5032 If MS extensions are enabled and foo names a structure, then
5033 again this is an anonymous struct.
5034 Otherwise this is an error.
5036 Oh what a horrid tangled web we weave. I wonder if MS consciously
5037 took this from Plan 9 or if it was an accident of implementation
5038 that took root before someone noticed the bug... */
5040 tree type = declspecs->type;
5041 bool type_ok = (TREE_CODE (type) == RECORD_TYPE
5042 || TREE_CODE (type) == UNION_TYPE);
5046 && (flag_ms_extensions || !declspecs->typedef_p))
5048 if (flag_ms_extensions)
5052 else if (TYPE_NAME (type) == NULL)
5059 pedwarn ("declaration does not declare anything");
5063 pedwarn ("ISO C doesn%'t support unnamed structs/unions");
5066 value = grokdeclarator (declarator, declspecs, FIELD, false,
5067 width ? &width : NULL);
5069 finish_decl (value, NULL_TREE, NULL_TREE);
5070 DECL_INITIAL (value) = width;
5075 /* Generate an error for any duplicate field names in FIELDLIST. Munge
5076 the list such that this does not present a problem later. */
5079 detect_field_duplicates (tree fieldlist)
5084 /* First, see if there are more than "a few" fields.
5085 This is trivially true if there are zero or one fields. */
5088 x = TREE_CHAIN (fieldlist);
5094 } while (timeout > 0 && x);
5096 /* If there were "few" fields, avoid the overhead of allocating
5097 a hash table. Instead just do the nested traversal thing. */
5100 for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x))
5103 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
5104 if (DECL_NAME (y) == DECL_NAME (x))
5106 error ("%Jduplicate member %qD", x, x);
5107 DECL_NAME (x) = NULL_TREE;
5113 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
5116 for (x = fieldlist; x ; x = TREE_CHAIN (x))
5117 if ((y = DECL_NAME (x)) != 0)
5119 slot = htab_find_slot (htab, y, INSERT);
5122 error ("%Jduplicate member %qD", x, x);
5123 DECL_NAME (x) = NULL_TREE;
5132 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5133 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5134 ATTRIBUTES are attributes to be applied to the structure. */
5137 finish_struct (tree t, tree fieldlist, tree attributes)
5140 bool toplevel = file_scope == current_scope;
5141 int saw_named_field;
5143 /* If this type was previously laid out as a forward reference,
5144 make sure we lay it out again. */
5148 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5152 for (x = fieldlist; x; x = TREE_CHAIN (x))
5153 if (DECL_NAME (x) != 0)
5158 if (TREE_CODE (t) == UNION_TYPE)
5161 pedwarn ("union has no named members");
5163 pedwarn ("union has no members");
5168 pedwarn ("struct has no named members");
5170 pedwarn ("struct has no members");
5175 /* Install struct as DECL_CONTEXT of each field decl.
5176 Also process specified field sizes, found in the DECL_INITIAL,
5177 storing 0 there after the type has been changed to precision equal
5178 to its width, rather than the precision of the specified standard
5179 type. (Correct layout requires the original type to have been preserved
5182 saw_named_field = 0;
5183 for (x = fieldlist; x; x = TREE_CHAIN (x))
5185 DECL_CONTEXT (x) = t;
5186 DECL_PACKED (x) |= TYPE_PACKED (t);
5188 /* If any field is const, the structure type is pseudo-const. */
5189 if (TREE_READONLY (x))
5190 C_TYPE_FIELDS_READONLY (t) = 1;
5193 /* A field that is pseudo-const makes the structure likewise. */
5194 tree t1 = TREE_TYPE (x);
5195 while (TREE_CODE (t1) == ARRAY_TYPE)
5196 t1 = TREE_TYPE (t1);
5197 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5198 && C_TYPE_FIELDS_READONLY (t1))
5199 C_TYPE_FIELDS_READONLY (t) = 1;
5202 /* Any field that is volatile means variables of this type must be
5203 treated in some ways as volatile. */
5204 if (TREE_THIS_VOLATILE (x))
5205 C_TYPE_FIELDS_VOLATILE (t) = 1;
5207 /* Any field of nominal variable size implies structure is too. */
5208 if (C_DECL_VARIABLE_SIZE (x))
5209 C_TYPE_VARIABLE_SIZE (t) = 1;
5211 if (DECL_INITIAL (x))
5213 unsigned HOST_WIDE_INT width = tree_low_cst (DECL_INITIAL (x), 1);
5214 DECL_SIZE (x) = bitsize_int (width);
5215 DECL_BIT_FIELD (x) = 1;
5216 SET_DECL_C_BIT_FIELD (x);
5219 /* Detect flexible array member in an invalid context. */
5220 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5221 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5222 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5223 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5225 if (TREE_CODE (t) == UNION_TYPE)
5227 error ("%Jflexible array member in union", x);
5228 TREE_TYPE (x) = error_mark_node;
5230 else if (TREE_CHAIN (x) != NULL_TREE)
5232 error ("%Jflexible array member not at end of struct", x);
5233 TREE_TYPE (x) = error_mark_node;
5235 else if (!saw_named_field)
5237 error ("%Jflexible array member in otherwise empty struct", x);
5238 TREE_TYPE (x) = error_mark_node;
5242 if (pedantic && !in_system_header && TREE_CODE (t) == RECORD_TYPE
5243 && flexible_array_type_p (TREE_TYPE (x)))
5244 pedwarn ("%Jinvalid use of structure with flexible array member", x);
5247 saw_named_field = 1;
5250 detect_field_duplicates (fieldlist);
5252 /* Now we have the nearly final fieldlist. Record it,
5253 then lay out the structure or union (including the fields). */
5255 TYPE_FIELDS (t) = fieldlist;
5259 /* Give bit-fields their proper types. */
5261 tree *fieldlistp = &fieldlist;
5263 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp)
5264 && TREE_TYPE (*fieldlistp) != error_mark_node)
5266 unsigned HOST_WIDE_INT width
5267 = tree_low_cst (DECL_INITIAL (*fieldlistp), 1);
5268 tree type = TREE_TYPE (*fieldlistp);
5269 if (width != TYPE_PRECISION (type))
5270 TREE_TYPE (*fieldlistp)
5271 = build_nonstandard_integer_type (width, TYPE_UNSIGNED (type));
5272 DECL_INITIAL (*fieldlistp) = 0;
5275 fieldlistp = &TREE_CHAIN (*fieldlistp);
5278 /* Now we have the truly final field list.
5279 Store it in this type and in the variants. */
5281 TYPE_FIELDS (t) = fieldlist;
5283 /* If there are lots of fields, sort so we can look through them fast.
5284 We arbitrarily consider 16 or more elts to be "a lot". */
5289 for (x = fieldlist; x; x = TREE_CHAIN (x))
5291 if (len > 15 || DECL_NAME (x) == NULL)
5299 struct lang_type *space;
5300 struct sorted_fields_type *space2;
5302 len += list_length (x);
5304 /* Use the same allocation policy here that make_node uses, to
5305 ensure that this lives as long as the rest of the struct decl.
5306 All decls in an inline function need to be saved. */
5308 space = GGC_CNEW (struct lang_type);
5309 space2 = GGC_NEWVAR (struct sorted_fields_type,
5310 sizeof (struct sorted_fields_type) + len * sizeof (tree));
5314 field_array = &space2->elts[0];
5315 for (x = fieldlist; x; x = TREE_CHAIN (x))
5317 field_array[len++] = x;
5319 /* If there is anonymous struct or union, break out of the loop. */
5320 if (DECL_NAME (x) == NULL)
5323 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5326 TYPE_LANG_SPECIFIC (t) = space;
5327 TYPE_LANG_SPECIFIC (t)->s->len = len;
5328 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
5329 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5334 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5336 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5337 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5338 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5339 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5342 /* If this was supposed to be a transparent union, but we can't
5343 make it one, warn and turn off the flag. */
5344 if (TREE_CODE (t) == UNION_TYPE
5345 && TYPE_TRANSPARENT_UNION (t)
5346 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5348 TYPE_TRANSPARENT_UNION (t) = 0;
5349 warning ("union cannot be made transparent");
5352 /* If this structure or union completes the type of any previous
5353 variable declaration, lay it out and output its rtl. */
5354 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
5358 tree decl = TREE_VALUE (x);
5359 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5360 layout_array_type (TREE_TYPE (decl));
5361 if (TREE_CODE (decl) != TYPE_DECL)
5363 layout_decl (decl, 0);
5364 if (c_dialect_objc ())
5365 objc_check_decl (decl);
5366 rest_of_decl_compilation (decl, toplevel, 0);
5371 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
5373 /* Finish debugging output for this type. */
5374 rest_of_type_compilation (t, toplevel);
5376 /* If we're inside a function proper, i.e. not file-scope and not still
5377 parsing parameters, then arrange for the size of a variable sized type
5379 if (cur_stmt_list && variably_modified_type_p (t, NULL))
5380 add_stmt (build_stmt (DECL_EXPR, build_decl (TYPE_DECL, NULL, t)));
5385 /* Lay out the type T, and its element type, and so on. */
5388 layout_array_type (tree t)
5390 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5391 layout_array_type (TREE_TYPE (t));
5395 /* Begin compiling the definition of an enumeration type.
5396 NAME is its name (or null if anonymous).
5397 Returns the type object, as yet incomplete.
5398 Also records info about it so that build_enumerator
5399 may be used to declare the individual values as they are read. */
5402 start_enum (tree name)
5406 /* If this is the real definition for a previous forward reference,
5407 fill in the contents in the same object that used to be the
5408 forward reference. */
5411 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1);
5413 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5415 enumtype = make_node (ENUMERAL_TYPE);
5416 pushtag (name, enumtype);
5419 if (C_TYPE_BEING_DEFINED (enumtype))
5420 error ("nested redefinition of %<enum %s%>", IDENTIFIER_POINTER (name));
5422 C_TYPE_BEING_DEFINED (enumtype) = 1;
5424 if (TYPE_VALUES (enumtype) != 0)
5426 /* This enum is a named one that has been declared already. */
5427 error ("redeclaration of %<enum %s%>", IDENTIFIER_POINTER (name));
5429 /* Completely replace its old definition.
5430 The old enumerators remain defined, however. */
5431 TYPE_VALUES (enumtype) = 0;
5434 enum_next_value = integer_zero_node;
5437 if (flag_short_enums)
5438 TYPE_PACKED (enumtype) = 1;
5443 /* After processing and defining all the values of an enumeration type,
5444 install their decls in the enumeration type and finish it off.
5445 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5446 and ATTRIBUTES are the specified attributes.
5447 Returns ENUMTYPE. */
5450 finish_enum (tree enumtype, tree values, tree attributes)
5453 tree minnode = 0, maxnode = 0;
5454 int precision, unsign;
5455 bool toplevel = (file_scope == current_scope);
5456 struct lang_type *lt;
5458 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5460 /* Calculate the maximum value of any enumerator in this type. */
5462 if (values == error_mark_node)
5463 minnode = maxnode = integer_zero_node;
5466 minnode = maxnode = TREE_VALUE (values);
5467 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5469 tree value = TREE_VALUE (pair);
5470 if (tree_int_cst_lt (maxnode, value))
5472 if (tree_int_cst_lt (value, minnode))
5477 /* Construct the final type of this enumeration. It is the same
5478 as one of the integral types - the narrowest one that fits, except
5479 that normally we only go as narrow as int - and signed iff any of
5480 the values are negative. */
5481 unsign = (tree_int_cst_sgn (minnode) >= 0);
5482 precision = MAX (min_precision (minnode, unsign),
5483 min_precision (maxnode, unsign));
5485 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5487 tem = c_common_type_for_size (precision, unsign);
5490 warning ("enumeration values exceed range of largest integer");
5491 tem = long_long_integer_type_node;
5495 tem = unsign ? unsigned_type_node : integer_type_node;
5497 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem);
5498 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem);
5499 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem);
5500 TYPE_SIZE (enumtype) = 0;
5502 /* If the precision of the type was specific with an attribute and it
5503 was too small, give an error. Otherwise, use it. */
5504 if (TYPE_PRECISION (enumtype))
5506 if (precision > TYPE_PRECISION (enumtype))
5507 error ("specified mode too small for enumeral values");
5510 TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem);
5512 layout_type (enumtype);
5514 if (values != error_mark_node)
5516 /* Change the type of the enumerators to be the enum type. We
5517 need to do this irrespective of the size of the enum, for
5518 proper type checking. Replace the DECL_INITIALs of the
5519 enumerators, and the value slots of the list, with copies
5520 that have the enum type; they cannot be modified in place
5521 because they may be shared (e.g. integer_zero_node) Finally,
5522 change the purpose slots to point to the names of the decls. */
5523 for (pair = values; pair; pair = TREE_CHAIN (pair))
5525 tree enu = TREE_PURPOSE (pair);
5526 tree ini = DECL_INITIAL (enu);
5528 TREE_TYPE (enu) = enumtype;
5530 /* The ISO C Standard mandates enumerators to have type int,
5531 even though the underlying type of an enum type is
5532 unspecified. Here we convert any enumerators that fit in
5533 an int to type int, to avoid promotions to unsigned types
5534 when comparing integers with enumerators that fit in the
5535 int range. When -pedantic is given, build_enumerator()
5536 would have already taken care of those that don't fit. */
5537 if (int_fits_type_p (ini, integer_type_node))
5538 tem = integer_type_node;
5541 ini = convert (tem, ini);
5543 DECL_INITIAL (enu) = ini;
5544 TREE_PURPOSE (pair) = DECL_NAME (enu);
5545 TREE_VALUE (pair) = ini;
5548 TYPE_VALUES (enumtype) = values;
5551 /* Record the min/max values so that we can warn about bit-field
5552 enumerations that are too small for the values. */
5553 lt = GGC_CNEW (struct lang_type);
5554 lt->enum_min = minnode;
5555 lt->enum_max = maxnode;
5556 TYPE_LANG_SPECIFIC (enumtype) = lt;
5558 /* Fix up all variant types of this enum type. */
5559 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5561 if (tem == enumtype)
5563 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5564 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5565 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5566 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5567 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5568 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5569 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5570 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5571 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5572 TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype);
5573 TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype);
5576 /* Finish debugging output for this type. */
5577 rest_of_type_compilation (enumtype, toplevel);
5582 /* Build and install a CONST_DECL for one value of the
5583 current enumeration type (one that was begun with start_enum).
5584 Return a tree-list containing the CONST_DECL and its value.
5585 Assignment of sequential values by default is handled here. */
5588 build_enumerator (tree name, tree value)
5592 /* Validate and default VALUE. */
5594 /* Remove no-op casts from the value. */
5596 STRIP_TYPE_NOPS (value);
5600 /* Don't issue more errors for error_mark_node (i.e. an
5601 undeclared identifier) - just ignore the value expression. */
5602 if (value == error_mark_node)
5604 else if (TREE_CODE (value) != INTEGER_CST)
5606 error ("enumerator value for %qE is not an integer constant", name);
5611 value = default_conversion (value);
5612 constant_expression_warning (value);
5616 /* Default based on previous value. */
5617 /* It should no longer be possible to have NON_LVALUE_EXPR
5621 value = enum_next_value;
5623 error ("overflow in enumeration values");
5626 if (pedantic && !int_fits_type_p (value, integer_type_node))
5628 pedwarn ("ISO C restricts enumerator values to range of %<int%>");
5629 /* XXX This causes -pedantic to change the meaning of the program.
5630 Remove? -zw 2004-03-15 */
5631 value = convert (integer_type_node, value);
5634 /* Set basis for default for next value. */
5635 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5636 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5638 /* Now create a declaration for the enum value name. */
5640 type = TREE_TYPE (value);
5641 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
5642 TYPE_PRECISION (integer_type_node)),
5643 (TYPE_PRECISION (type)
5644 >= TYPE_PRECISION (integer_type_node)
5645 && TYPE_UNSIGNED (type)));
5647 decl = build_decl (CONST_DECL, name, type);
5648 DECL_INITIAL (decl) = convert (type, value);
5651 return tree_cons (decl, value, NULL_TREE);
5655 /* Create the FUNCTION_DECL for a function definition.
5656 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5657 the declaration; they describe the function's name and the type it returns,
5658 but twisted together in a fashion that parallels the syntax of C.
5660 This function creates a binding context for the function body
5661 as well as setting up the FUNCTION_DECL in current_function_decl.
5663 Returns 1 on success. If the DECLARATOR is not suitable for a function
5664 (it defines a datum instead), we return 0, which tells
5665 yyparse to report a parse error. */
5668 start_function (struct c_declspecs *declspecs, struct c_declarator *declarator,
5671 tree decl1, old_decl;
5672 tree restype, resdecl;
5674 current_function_returns_value = 0; /* Assume, until we see it does. */
5675 current_function_returns_null = 0;
5676 current_function_returns_abnormally = 0;
5677 warn_about_return_type = 0;
5678 current_extern_inline = 0;
5679 c_switch_stack = NULL;
5681 /* Indicate no valid break/continue context by setting these variables
5682 to some non-null, non-label value. We'll notice and emit the proper
5683 error message in c_finish_bc_stmt. */
5684 c_break_label = c_cont_label = size_zero_node;
5686 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, true, NULL);
5688 /* If the declarator is not suitable for a function definition,
5689 cause a syntax error. */
5693 decl_attributes (&decl1, attributes, 0);
5695 if (DECL_DECLARED_INLINE_P (decl1)
5696 && DECL_UNINLINABLE (decl1)
5697 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
5698 warning ("%Jinline function %qD given attribute noinline", decl1, decl1);
5700 announce_function (decl1);
5702 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5704 error ("return type is an incomplete type");
5705 /* Make it return void instead. */
5707 = build_function_type (void_type_node,
5708 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5711 if (warn_about_return_type)
5712 pedwarn_c99 ("return type defaults to %<int%>");
5714 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5715 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
5716 DECL_INITIAL (decl1) = error_mark_node;
5718 /* If this definition isn't a prototype and we had a prototype declaration
5719 before, copy the arg type info from that prototype. */
5720 old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope);
5721 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5722 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
5723 TREE_TYPE (TREE_TYPE (old_decl)))
5724 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5726 TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl),
5728 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
5731 /* Optionally warn of old-fashioned def with no previous prototype. */
5732 if (warn_strict_prototypes
5733 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5734 && C_DECL_ISNT_PROTOTYPE (old_decl))
5735 warning ("function declaration isn%'t a prototype");
5736 /* Optionally warn of any global def with no previous prototype. */
5737 else if (warn_missing_prototypes
5738 && TREE_PUBLIC (decl1)
5739 && !MAIN_NAME_P (DECL_NAME (decl1))
5740 && C_DECL_ISNT_PROTOTYPE (old_decl))
5741 warning ("%Jno previous prototype for %qD", decl1, decl1);
5742 /* Optionally warn of any def with no previous prototype
5743 if the function has already been used. */
5744 else if (warn_missing_prototypes
5745 && old_decl != 0 && TREE_USED (old_decl)
5746 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5747 warning ("%J%qD was used with no prototype before its definition",
5749 /* Optionally warn of any global def with no previous declaration. */
5750 else if (warn_missing_declarations
5751 && TREE_PUBLIC (decl1)
5753 && !MAIN_NAME_P (DECL_NAME (decl1)))
5754 warning ("%Jno previous declaration for %qD", decl1, decl1);
5755 /* Optionally warn of any def with no previous declaration
5756 if the function has already been used. */
5757 else if (warn_missing_declarations
5758 && old_decl != 0 && TREE_USED (old_decl)
5759 && C_DECL_IMPLICIT (old_decl))
5760 warning ("%J%qD was used with no declaration before its definition",
5763 /* This is a definition, not a reference.
5764 So normally clear DECL_EXTERNAL.
5765 However, `extern inline' acts like a declaration
5766 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5767 DECL_EXTERNAL (decl1) = current_extern_inline;
5769 /* This function exists in static storage.
5770 (This does not mean `static' in the C sense!) */
5771 TREE_STATIC (decl1) = 1;
5773 /* A nested function is not global. */
5774 if (current_function_decl != 0)
5775 TREE_PUBLIC (decl1) = 0;
5777 /* This is the earliest point at which we might know the assembler
5778 name of the function. Thus, if it's set before this, die horribly. */
5779 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1));
5781 /* If #pragma weak was used, mark the decl weak now. */
5782 if (current_scope == file_scope)
5783 maybe_apply_pragma_weak (decl1);
5785 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5786 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
5791 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5792 != integer_type_node)
5793 pedwarn ("%Jreturn type of %qD is not %<int%>", decl1, decl1);
5795 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
5796 args = TREE_CHAIN (args))
5798 tree type = args ? TREE_VALUE (args) : 0;
5800 if (type == void_type_node)
5807 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
5808 pedwarn ("%Jfirst argument of %qD should be %<int%>",
5813 if (TREE_CODE (type) != POINTER_TYPE
5814 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5815 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5817 pedwarn ("%Jsecond argument of %qD should be %<char **%>",
5822 if (TREE_CODE (type) != POINTER_TYPE
5823 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5824 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5826 pedwarn ("%Jthird argument of %qD should probably be "
5827 "%<char **%>", decl1, decl1);
5832 /* It is intentional that this message does not mention the third
5833 argument because it's only mentioned in an appendix of the
5835 if (argct > 0 && (argct < 2 || argct > 3))
5836 pedwarn ("%J%qD takes only zero or two arguments", decl1, decl1);
5838 if (!TREE_PUBLIC (decl1))
5839 pedwarn ("%J%qD is normally a non-static function", decl1, decl1);
5842 /* Record the decl so that the function name is defined.
5843 If we already have a decl for this name, and it is a FUNCTION_DECL,
5844 use the old decl. */
5846 current_function_decl = pushdecl (decl1);
5849 declare_parm_level ();
5851 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5852 /* Promote the value to int before returning it. */
5853 if (c_promoting_integer_type_p (restype))
5855 /* It retains unsignedness if not really getting wider. */
5856 if (TYPE_UNSIGNED (restype)
5857 && (TYPE_PRECISION (restype)
5858 == TYPE_PRECISION (integer_type_node)))
5859 restype = unsigned_type_node;
5861 restype = integer_type_node;
5864 resdecl = build_decl (RESULT_DECL, NULL_TREE, restype);
5865 DECL_ARTIFICIAL (resdecl) = 1;
5866 DECL_IGNORED_P (resdecl) = 1;
5867 DECL_RESULT (current_function_decl) = resdecl;
5869 start_fname_decls ();
5874 /* Subroutine of store_parm_decls which handles new-style function
5875 definitions (prototype format). The parms already have decls, so we
5876 need only record them as in effect and complain if any redundant
5877 old-style parm decls were written. */
5879 store_parm_decls_newstyle (tree fndecl, const struct c_arg_info *arg_info)
5883 if (current_scope->bindings)
5885 error ("%Jold-style parameter declarations in prototyped "
5886 "function definition", fndecl);
5888 /* Get rid of the old-style declarations. */
5892 /* Don't issue this warning for nested functions, and don't issue this
5893 warning if we got here because ARG_INFO_TYPES was error_mark_node
5894 (this happens when a function definition has just an ellipsis in
5895 its parameter list). */
5896 else if (warn_traditional && !in_system_header && !current_function_scope
5897 && arg_info->types != error_mark_node)
5898 warning ("%Jtraditional C rejects ISO C style function definitions",
5901 /* Now make all the parameter declarations visible in the function body.
5902 We can bypass most of the grunt work of pushdecl. */
5903 for (decl = arg_info->parms; decl; decl = TREE_CHAIN (decl))
5905 DECL_CONTEXT (decl) = current_function_decl;
5906 if (DECL_NAME (decl))
5907 bind (DECL_NAME (decl), decl, current_scope,
5908 /*invisible=*/false, /*nested=*/false);
5910 error ("%Jparameter name omitted", decl);
5913 /* Record the parameter list in the function declaration. */
5914 DECL_ARGUMENTS (fndecl) = arg_info->parms;
5916 /* Now make all the ancillary declarations visible, likewise. */
5917 for (decl = arg_info->others; decl; decl = TREE_CHAIN (decl))
5919 DECL_CONTEXT (decl) = current_function_decl;
5920 if (DECL_NAME (decl))
5921 bind (DECL_NAME (decl), decl, current_scope,
5922 /*invisible=*/false, /*nested=*/false);
5925 /* And all the tag declarations. */
5926 for (decl = arg_info->tags; decl; decl = TREE_CHAIN (decl))
5927 if (TREE_PURPOSE (decl))
5928 bind (TREE_PURPOSE (decl), TREE_VALUE (decl), current_scope,
5929 /*invisible=*/false, /*nested=*/false);
5932 /* Subroutine of store_parm_decls which handles old-style function
5933 definitions (separate parameter list and declarations). */
5936 store_parm_decls_oldstyle (tree fndecl, const struct c_arg_info *arg_info)
5938 struct c_binding *b;
5939 tree parm, decl, last;
5940 tree parmids = arg_info->parms;
5942 /* We use DECL_WEAK as a flag to show which parameters have been
5943 seen already, since it is not used on PARM_DECL. */
5944 #ifdef ENABLE_CHECKING
5945 for (b = current_scope->bindings; b; b = b->prev)
5946 gcc_assert (TREE_CODE (b->decl) != PARM_DECL || !DECL_WEAK (b->decl));
5949 if (warn_old_style_definition && !in_system_header)
5950 warning ("%Jold-style function definition", fndecl);
5952 /* Match each formal parameter name with its declaration. Save each
5953 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
5954 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
5956 if (TREE_VALUE (parm) == 0)
5958 error ("%Jparameter name missing from parameter list", fndecl);
5959 TREE_PURPOSE (parm) = 0;
5963 b = I_SYMBOL_BINDING (TREE_VALUE (parm));
5964 if (b && B_IN_CURRENT_SCOPE (b))
5967 /* If we got something other than a PARM_DECL it is an error. */
5968 if (TREE_CODE (decl) != PARM_DECL)
5969 error ("%J%qD declared as a non-parameter", decl, decl);
5970 /* If the declaration is already marked, we have a duplicate
5971 name. Complain and ignore the duplicate. */
5972 else if (DECL_WEAK (decl))
5974 error ("%Jmultiple parameters named %qD", decl, decl);
5975 TREE_PURPOSE (parm) = 0;
5978 /* If the declaration says "void", complain and turn it into
5980 else if (VOID_TYPE_P (TREE_TYPE (decl)))
5982 error ("%Jparameter %qD declared with void type", decl, decl);
5983 TREE_TYPE (decl) = integer_type_node;
5984 DECL_ARG_TYPE (decl) = integer_type_node;
5985 layout_decl (decl, 0);
5988 /* If no declaration found, default to int. */
5991 decl = build_decl (PARM_DECL, TREE_VALUE (parm), integer_type_node);
5992 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
5993 DECL_SOURCE_LOCATION (decl) = DECL_SOURCE_LOCATION (fndecl);
5997 pedwarn ("%Jtype of %qD defaults to %<int%>", decl, decl);
5998 else if (extra_warnings)
5999 warning ("%Jtype of %qD defaults to %<int%>", decl, decl);
6002 TREE_PURPOSE (parm) = decl;
6003 DECL_WEAK (decl) = 1;
6006 /* Now examine the parms chain for incomplete declarations
6007 and declarations with no corresponding names. */
6009 for (b = current_scope->bindings; b; b = b->prev)
6012 if (TREE_CODE (parm) != PARM_DECL)
6015 if (TREE_TYPE (parm) != error_mark_node
6016 && !COMPLETE_TYPE_P (TREE_TYPE (parm)))
6018 error ("%Jparameter %qD has incomplete type", parm, parm);
6019 TREE_TYPE (parm) = error_mark_node;
6022 if (!DECL_WEAK (parm))
6024 error ("%Jdeclaration for parameter %qD but no such parameter",
6027 /* Pretend the parameter was not missing.
6028 This gets us to a standard state and minimizes
6029 further error messages. */
6030 parmids = chainon (parmids, tree_cons (parm, 0, 0));
6034 /* Chain the declarations together in the order of the list of
6035 names. Store that chain in the function decl, replacing the
6036 list of names. Update the current scope to match. */
6037 DECL_ARGUMENTS (fndecl) = 0;
6039 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
6040 if (TREE_PURPOSE (parm))
6042 if (parm && TREE_PURPOSE (parm))
6044 last = TREE_PURPOSE (parm);
6045 DECL_ARGUMENTS (fndecl) = last;
6046 DECL_WEAK (last) = 0;
6048 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
6049 if (TREE_PURPOSE (parm))
6051 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6052 last = TREE_PURPOSE (parm);
6053 DECL_WEAK (last) = 0;
6055 TREE_CHAIN (last) = 0;
6058 /* If there was a previous prototype,
6059 set the DECL_ARG_TYPE of each argument according to
6060 the type previously specified, and report any mismatches. */
6062 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6065 for (parm = DECL_ARGUMENTS (fndecl),
6066 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6067 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6068 != void_type_node));
6069 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6071 if (parm == 0 || type == 0
6072 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6074 error ("number of arguments doesn%'t match prototype");
6075 error ("%Hprototype declaration",
6076 ¤t_function_prototype_locus);
6079 /* Type for passing arg must be consistent with that
6080 declared for the arg. ISO C says we take the unqualified
6081 type for parameters declared with qualified type. */
6082 if (!comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6083 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
6085 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6086 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6088 /* Adjust argument to match prototype. E.g. a previous
6089 `int foo(float);' prototype causes
6090 `int foo(x) float x; {...}' to be treated like
6091 `int foo(float x) {...}'. This is particularly
6092 useful for argument types like uid_t. */
6093 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6095 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
6096 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6097 && TYPE_PRECISION (TREE_TYPE (parm))
6098 < TYPE_PRECISION (integer_type_node))
6099 DECL_ARG_TYPE (parm) = integer_type_node;
6103 pedwarn ("promoted argument %qD "
6104 "doesn%'t match prototype", parm);
6105 pedwarn ("%Hprototype declaration",
6106 ¤t_function_prototype_locus);
6111 error ("argument %qD doesn%'t match prototype", parm);
6112 error ("%Hprototype declaration",
6113 ¤t_function_prototype_locus);
6117 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6120 /* Otherwise, create a prototype that would match. */
6124 tree actual = 0, last = 0, type;
6126 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6128 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6130 TREE_CHAIN (last) = type;
6135 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6137 TREE_CHAIN (last) = type;
6141 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6142 of the type of this function, but we need to avoid having this
6143 affect the types of other similarly-typed functions, so we must
6144 first force the generation of an identical (but separate) type
6145 node for the relevant function type. The new node we create
6146 will be a variant of the main variant of the original function
6149 TREE_TYPE (fndecl) = build_variant_type_copy (TREE_TYPE (fndecl));
6151 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6155 /* Store parameter declarations passed in ARG_INFO into the current
6156 function declaration. */
6159 store_parm_decls_from (struct c_arg_info *arg_info)
6161 current_function_arg_info = arg_info;
6162 store_parm_decls ();
6165 /* Store the parameter declarations into the current function declaration.
6166 This is called after parsing the parameter declarations, before
6167 digesting the body of the function.
6169 For an old-style definition, construct a prototype out of the old-style
6170 parameter declarations and inject it into the function's type. */
6173 store_parm_decls (void)
6175 tree fndecl = current_function_decl;
6178 /* The argument information block for FNDECL. */
6179 struct c_arg_info *arg_info = current_function_arg_info;
6180 current_function_arg_info = 0;
6182 /* True if this definition is written with a prototype. Note:
6183 despite C99 6.7.5.3p14, we can *not* treat an empty argument
6184 list in a function definition as equivalent to (void) -- an
6185 empty argument list specifies the function has no parameters,
6186 but only (void) sets up a prototype for future calls. */
6187 proto = arg_info->types != 0;
6190 store_parm_decls_newstyle (fndecl, arg_info);
6192 store_parm_decls_oldstyle (fndecl, arg_info);
6194 /* The next call to push_scope will be a function body. */
6196 next_is_function_body = true;
6198 /* Write a record describing this function definition to the prototypes
6199 file (if requested). */
6201 gen_aux_info_record (fndecl, 1, 0, proto);
6203 /* Initialize the RTL code for the function. */
6204 allocate_struct_function (fndecl);
6206 /* Begin the statement tree for this function. */
6207 DECL_SAVED_TREE (fndecl) = push_stmt_list ();
6209 /* ??? Insert the contents of the pending sizes list into the function
6210 to be evaluated. The only reason left to have this is
6211 void foo(int n, int array[n++])
6212 because we throw away the array type in favor of a pointer type, and
6213 thus won't naturally see the SAVE_EXPR containing the increment. All
6214 other pending sizes would be handled by gimplify_parameters. */
6217 for (t = nreverse (get_pending_sizes ()); t ; t = TREE_CHAIN (t))
6218 add_stmt (TREE_VALUE (t));
6221 /* Even though we're inside a function body, we still don't want to
6222 call expand_expr to calculate the size of a variable-sized array.
6223 We haven't necessarily assigned RTL to all variables yet, so it's
6224 not safe to try to expand expressions involving them. */
6225 cfun->x_dont_save_pending_sizes_p = 1;
6228 /* Handle attribute((warn_unused_result)) on FNDECL and all its nested
6232 c_warn_unused_result_recursively (tree fndecl)
6234 struct cgraph_node *cgn;
6236 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
6237 c_warn_unused_result (&DECL_SAVED_TREE (fndecl));
6239 /* Finalize all nested functions now. */
6240 cgn = cgraph_node (fndecl);
6241 for (cgn = cgn->nested; cgn ; cgn = cgn->next_nested)
6242 c_warn_unused_result_recursively (cgn->decl);
6245 /* Finish up a function declaration and compile that function
6246 all the way to assembler language output. The free the storage
6247 for the function definition.
6249 This is called after parsing the body of the function definition. */
6252 finish_function (void)
6254 tree fndecl = current_function_decl;
6256 if (TREE_CODE (fndecl) == FUNCTION_DECL
6257 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
6259 tree args = DECL_ARGUMENTS (fndecl);
6260 for (; args; args = TREE_CHAIN (args))
6262 tree type = TREE_TYPE (args);
6263 if (INTEGRAL_TYPE_P (type)
6264 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
6265 DECL_ARG_TYPE (args) = integer_type_node;
6269 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6270 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6272 /* Must mark the RESULT_DECL as being in this function. */
6274 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
6275 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6277 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6279 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6280 != integer_type_node)
6282 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6283 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6285 pedwarn ("%Jreturn type of %qD is not %<int%>", fndecl, fndecl);
6290 c_finish_return (integer_zero_node);
6294 /* Tie off the statement tree for this function. */
6295 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
6297 finish_fname_decls ();
6299 /* Complain if there's just no return statement. */
6300 if (warn_return_type
6301 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6302 && !current_function_returns_value && !current_function_returns_null
6303 /* Don't complain if we abort. */
6304 && !current_function_returns_abnormally
6305 /* Don't warn for main(). */
6306 && !MAIN_NAME_P (DECL_NAME (fndecl))
6307 /* Or if they didn't actually specify a return type. */
6308 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6309 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6310 inline function, as we might never be compiled separately. */
6311 && DECL_INLINE (fndecl))
6312 warning ("no return statement in function returning non-void");
6314 /* With just -Wextra, complain only if function returns both with
6315 and without a value. */
6317 && current_function_returns_value
6318 && current_function_returns_null)
6319 warning ("this function may return with or without a value");
6321 /* Store the end of the function, so that we get good line number
6322 info for the epilogue. */
6323 cfun->function_end_locus = input_location;
6325 /* If we don't have ctors/dtors sections, and this is a static
6326 constructor or destructor, it must be recorded now. */
6327 if (DECL_STATIC_CONSTRUCTOR (fndecl)
6328 && !targetm.have_ctors_dtors)
6329 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6330 if (DECL_STATIC_DESTRUCTOR (fndecl)
6331 && !targetm.have_ctors_dtors)
6332 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6334 /* Finalize the ELF visibility for the function. */
6335 c_determine_visibility (fndecl);
6337 /* Genericize before inlining. Delay genericizing nested functions
6338 until their parent function is genericized. Since finalizing
6339 requires GENERIC, delay that as well. */
6341 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6343 if (!decl_function_context (fndecl))
6345 c_genericize (fndecl);
6346 c_warn_unused_result_recursively (fndecl);
6348 /* ??? Objc emits functions after finalizing the compilation unit.
6349 This should be cleaned up later and this conditional removed. */
6350 if (cgraph_global_info_ready)
6352 c_expand_body (fndecl);
6356 cgraph_finalize_function (fndecl, false);
6360 /* Register this function with cgraph just far enough to get it
6361 added to our parent's nested function list. Handy, since the
6362 C front end doesn't have such a list. */
6363 (void) cgraph_node (fndecl);
6367 /* We're leaving the context of this function, so zap cfun.
6368 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
6369 tree_rest_of_compilation. */
6371 current_function_decl = NULL;
6374 /* Generate the RTL for the body of FNDECL. */
6377 c_expand_body (tree fndecl)
6380 if (!DECL_INITIAL (fndecl)
6381 || DECL_INITIAL (fndecl) == error_mark_node)
6384 tree_rest_of_compilation (fndecl);
6386 if (DECL_STATIC_CONSTRUCTOR (fndecl)
6387 && targetm.have_ctors_dtors)
6388 targetm.asm_out.constructor (XEXP (DECL_RTL (fndecl), 0),
6389 DEFAULT_INIT_PRIORITY);
6390 if (DECL_STATIC_DESTRUCTOR (fndecl)
6391 && targetm.have_ctors_dtors)
6392 targetm.asm_out.destructor (XEXP (DECL_RTL (fndecl), 0),
6393 DEFAULT_INIT_PRIORITY);
6396 /* Check the declarations given in a for-loop for satisfying the C99
6399 check_for_loop_decls (void)
6401 struct c_binding *b;
6405 /* If we get here, declarations have been used in a for loop without
6406 the C99 for loop scope. This doesn't make much sense, so don't
6408 error ("%<for%> loop initial declaration used outside C99 mode");
6411 /* C99 subclause 6.8.5 paragraph 3:
6413 [#3] The declaration part of a for statement shall only
6414 declare identifiers for objects having storage class auto or
6417 It isn't clear whether, in this sentence, "identifiers" binds to
6418 "shall only declare" or to "objects" - that is, whether all identifiers
6419 declared must be identifiers for objects, or whether the restriction
6420 only applies to those that are. (A question on this in comp.std.c
6421 in November 2000 received no answer.) We implement the strictest
6422 interpretation, to avoid creating an extension which later causes
6425 for (b = current_scope->bindings; b; b = b->prev)
6428 tree decl = b->decl;
6433 switch (TREE_CODE (decl))
6436 if (TREE_STATIC (decl))
6437 error ("%Jdeclaration of static variable %qD in %<for%> loop "
6438 "initial declaration", decl, decl);
6439 else if (DECL_EXTERNAL (decl))
6440 error ("%Jdeclaration of %<extern%> variable %qD in %<for%> loop "
6441 "initial declaration", decl, decl);
6445 error ("%<struct %E%> declared in %<for%> loop initial declaration",
6449 error ("%<union %E%> declared in %<for%> loop initial declaration",
6453 error ("%<enum %E%> declared in %<for%> loop initial declaration",
6457 error ("%Jdeclaration of non-variable %qD in %<for%> loop "
6458 "initial declaration", decl, decl);
6463 /* Save and reinitialize the variables
6464 used during compilation of a C function. */
6467 c_push_function_context (struct function *f)
6469 struct language_function *p;
6470 p = GGC_NEW (struct language_function);
6473 p->base.x_stmt_tree = c_stmt_tree;
6474 p->x_break_label = c_break_label;
6475 p->x_cont_label = c_cont_label;
6476 p->x_switch_stack = c_switch_stack;
6477 p->arg_info = current_function_arg_info;
6478 p->returns_value = current_function_returns_value;
6479 p->returns_null = current_function_returns_null;
6480 p->returns_abnormally = current_function_returns_abnormally;
6481 p->warn_about_return_type = warn_about_return_type;
6482 p->extern_inline = current_extern_inline;
6485 /* Restore the variables used during compilation of a C function. */
6488 c_pop_function_context (struct function *f)
6490 struct language_function *p = f->language;
6492 if (DECL_STRUCT_FUNCTION (current_function_decl) == 0
6493 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6495 /* Stop pointing to the local nodes about to be freed. */
6496 /* But DECL_INITIAL must remain nonzero so we know this
6497 was an actual function definition. */
6498 DECL_INITIAL (current_function_decl) = error_mark_node;
6499 DECL_ARGUMENTS (current_function_decl) = 0;
6502 c_stmt_tree = p->base.x_stmt_tree;
6503 c_break_label = p->x_break_label;
6504 c_cont_label = p->x_cont_label;
6505 c_switch_stack = p->x_switch_stack;
6506 current_function_arg_info = p->arg_info;
6507 current_function_returns_value = p->returns_value;
6508 current_function_returns_null = p->returns_null;
6509 current_function_returns_abnormally = p->returns_abnormally;
6510 warn_about_return_type = p->warn_about_return_type;
6511 current_extern_inline = p->extern_inline;
6516 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6519 c_dup_lang_specific_decl (tree decl)
6521 struct lang_decl *ld;
6523 if (!DECL_LANG_SPECIFIC (decl))
6526 ld = GGC_NEW (struct lang_decl);
6527 memcpy (ld, DECL_LANG_SPECIFIC (decl), sizeof (struct lang_decl));
6528 DECL_LANG_SPECIFIC (decl) = ld;
6531 /* The functions below are required for functionality of doing
6532 function at once processing in the C front end. Currently these
6533 functions are not called from anywhere in the C front end, but as
6534 these changes continue, that will change. */
6536 /* Returns nonzero if the current statement is a full expression,
6537 i.e. temporaries created during that statement should be destroyed
6538 at the end of the statement. */
6541 stmts_are_full_exprs_p (void)
6546 /* Returns the stmt_tree (if any) to which statements are currently
6547 being added. If there is no active statement-tree, NULL is
6551 current_stmt_tree (void)
6553 return &c_stmt_tree;
6556 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6560 anon_aggr_type_p (tree ARG_UNUSED (node))
6565 /* Return the global value of T as a symbol. */
6568 identifier_global_value (tree t)
6570 struct c_binding *b;
6572 for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed)
6573 if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b))
6579 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
6580 otherwise the name is found in ridpointers from RID_INDEX. */
6583 record_builtin_type (enum rid rid_index, const char *name, tree type)
6587 id = ridpointers[(int) rid_index];
6589 id = get_identifier (name);
6590 decl = build_decl (TYPE_DECL, id, type);
6592 if (debug_hooks->type_decl)
6593 debug_hooks->type_decl (decl, false);
6596 /* Build the void_list_node (void_type_node having been created). */
6598 build_void_list_node (void)
6600 tree t = build_tree_list (NULL_TREE, void_type_node);
6604 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
6607 build_c_parm (struct c_declspecs *specs, tree attrs,
6608 struct c_declarator *declarator)
6610 struct c_parm *ret = XOBNEW (&parser_obstack, struct c_parm);
6613 ret->declarator = declarator;
6617 /* Return a declarator with nested attributes. TARGET is the inner
6618 declarator to which these attributes apply. ATTRS are the
6621 struct c_declarator *
6622 build_attrs_declarator (tree attrs, struct c_declarator *target)
6624 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6625 ret->kind = cdk_attrs;
6626 ret->declarator = target;
6627 ret->u.attrs = attrs;
6631 /* Return a declarator for a function with arguments specified by ARGS
6632 and return type specified by TARGET. */
6634 struct c_declarator *
6635 build_function_declarator (struct c_arg_info *args,
6636 struct c_declarator *target)
6638 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6639 ret->kind = cdk_function;
6640 ret->declarator = target;
6641 ret->u.arg_info = args;
6645 /* Return a declarator for the identifier IDENT (which may be
6646 NULL_TREE for an abstract declarator). */
6648 struct c_declarator *
6649 build_id_declarator (tree ident)
6651 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6653 ret->declarator = 0;
6658 /* Return something to represent absolute declarators containing a *.
6659 TARGET is the absolute declarator that the * contains.
6660 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
6661 to apply to the pointer type. */
6663 struct c_declarator *
6664 make_pointer_declarator (struct c_declspecs *type_quals_attrs,
6665 struct c_declarator *target)
6669 struct c_declarator *itarget = target;
6670 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6671 if (type_quals_attrs)
6673 attrs = type_quals_attrs->attrs;
6674 quals = quals_from_declspecs (type_quals_attrs);
6675 if (attrs != NULL_TREE)
6676 itarget = build_attrs_declarator (attrs, target);
6678 ret->kind = cdk_pointer;
6679 ret->declarator = itarget;
6680 ret->u.pointer_quals = quals;
6684 /* Return a pointer to a structure for an empty list of declaration
6687 struct c_declspecs *
6688 build_null_declspecs (void)
6690 struct c_declspecs *ret = XOBNEW (&parser_obstack, struct c_declspecs);
6694 ret->typespec_word = cts_none;
6695 ret->storage_class = csc_none;
6696 ret->non_sc_seen_p = false;
6697 ret->typedef_p = false;
6698 ret->tag_defined_p = false;
6699 ret->explicit_signed_p = false;
6700 ret->deprecated_p = false;
6701 ret->default_int_p = false;
6702 ret->long_p = false;
6703 ret->long_long_p = false;
6704 ret->short_p = false;
6705 ret->signed_p = false;
6706 ret->unsigned_p = false;
6707 ret->complex_p = false;
6708 ret->inline_p = false;
6709 ret->thread_p = false;
6710 ret->const_p = false;
6711 ret->volatile_p = false;
6712 ret->restrict_p = false;
6716 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
6719 struct c_declspecs *
6720 declspecs_add_qual (struct c_declspecs *specs, tree qual)
6724 specs->non_sc_seen_p = true;
6725 gcc_assert (TREE_CODE (qual) == IDENTIFIER_NODE
6726 && C_IS_RESERVED_WORD (qual));
6727 i = C_RID_CODE (qual);
6731 dupe = specs->const_p;
6732 specs->const_p = true;
6735 dupe = specs->volatile_p;
6736 specs->volatile_p = true;
6739 dupe = specs->restrict_p;
6740 specs->restrict_p = true;
6745 if (dupe && pedantic && !flag_isoc99)
6746 pedwarn ("duplicate %qs", IDENTIFIER_POINTER (qual));
6750 /* Add the type specifier TYPE to the declaration specifiers SPECS,
6753 struct c_declspecs *
6754 declspecs_add_type (struct c_declspecs *specs, struct c_typespec spec)
6756 tree type = spec.spec;
6757 specs->non_sc_seen_p = true;
6758 if (TREE_DEPRECATED (type))
6759 specs->deprecated_p = true;
6761 /* Handle type specifier keywords. */
6762 if (TREE_CODE (type) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (type))
6764 enum rid i = C_RID_CODE (type);
6767 error ("two or more data types in declaration specifiers");
6770 if ((int) i <= (int) RID_LAST_MODIFIER)
6772 /* "long", "short", "signed", "unsigned" or "_Complex". */
6777 if (specs->long_long_p)
6779 error ("%<long long long%> is too long for GCC");
6784 if (specs->typespec_word == cts_double)
6786 error ("both %<long long%> and %<double%> in "
6787 "declaration specifiers");
6790 if (pedantic && !flag_isoc99 && !in_system_header
6792 pedwarn ("ISO C90 does not support %<long long%>");
6793 specs->long_long_p = 1;
6797 error ("both %<long%> and %<short%> in "
6798 "declaration specifiers");
6799 else if (specs->typespec_word == cts_void)
6800 error ("both %<long%> and %<void%> in "
6801 "declaration specifiers");
6802 else if (specs->typespec_word == cts_bool)
6803 error ("both %<long%> and %<_Bool%> in "
6804 "declaration specifiers");
6805 else if (specs->typespec_word == cts_char)
6806 error ("both %<long%> and %<char%> in "
6807 "declaration specifiers");
6808 else if (specs->typespec_word == cts_float)
6809 error ("both %<long%> and %<float%> in "
6810 "declaration specifiers");
6812 specs->long_p = true;
6815 dupe = specs->short_p;
6817 error ("both %<long%> and %<short%> in "
6818 "declaration specifiers");
6819 else if (specs->typespec_word == cts_void)
6820 error ("both %<short%> and %<void%> in "
6821 "declaration specifiers");
6822 else if (specs->typespec_word == cts_bool)
6823 error ("both %<short%> and %<_Bool%> in "
6824 "declaration specifiers");
6825 else if (specs->typespec_word == cts_char)
6826 error ("both %<short%> and %<char%> in "
6827 "declaration specifiers");
6828 else if (specs->typespec_word == cts_float)
6829 error ("both %<short%> and %<float%> in "
6830 "declaration specifiers");
6831 else if (specs->typespec_word == cts_double)
6832 error ("both %<short%> and %<double%> in "
6833 "declaration specifiers");
6835 specs->short_p = true;
6838 dupe = specs->signed_p;
6839 if (specs->unsigned_p)
6840 error ("both %<signed%> and %<unsigned%> in "
6841 "declaration specifiers");
6842 else if (specs->typespec_word == cts_void)
6843 error ("both %<signed%> and %<void%> in "
6844 "declaration specifiers");
6845 else if (specs->typespec_word == cts_bool)
6846 error ("both %<signed%> and %<_Bool%> in "
6847 "declaration specifiers");
6848 else if (specs->typespec_word == cts_float)
6849 error ("both %<signed%> and %<float%> in "
6850 "declaration specifiers");
6851 else if (specs->typespec_word == cts_double)
6852 error ("both %<signed%> and %<double%> in "
6853 "declaration specifiers");
6855 specs->signed_p = true;
6858 dupe = specs->unsigned_p;
6859 if (specs->signed_p)
6860 error ("both %<signed%> and %<unsigned%> in "
6861 "declaration specifiers");
6862 else if (specs->typespec_word == cts_void)
6863 error ("both %<unsigned%> and %<void%> in "
6864 "declaration specifiers");
6865 else if (specs->typespec_word == cts_bool)
6866 error ("both %<unsigned%> and %<_Bool%> in "
6867 "declaration specifiers");
6868 else if (specs->typespec_word == cts_float)
6869 error ("both %<unsigned%> and %<float%> in "
6870 "declaration specifiers");
6871 else if (specs->typespec_word == cts_double)
6872 error ("both %<unsigned%> and %<double%> in "
6873 "declaration specifiers");
6875 specs->unsigned_p = true;
6878 dupe = specs->complex_p;
6879 if (pedantic && !flag_isoc99 && !in_system_header)
6880 pedwarn ("ISO C90 does not support complex types");
6881 if (specs->typespec_word == cts_void)
6882 error ("both %<complex%> and %<void%> in "
6883 "declaration specifiers");
6884 else if (specs->typespec_word == cts_bool)
6885 error ("both %<complex%> and %<_Bool%> in "
6886 "declaration specifiers");
6888 specs->complex_p = true;
6895 error ("duplicate %qs", IDENTIFIER_POINTER (type));
6901 /* "void", "_Bool", "char", "int", "float" or "double". */
6902 if (specs->typespec_word != cts_none)
6904 error ("two or more data types in declaration specifiers");
6911 error ("both %<long%> and %<void%> in "
6912 "declaration specifiers");
6913 else if (specs->short_p)
6914 error ("both %<short%> and %<void%> in "
6915 "declaration specifiers");
6916 else if (specs->signed_p)
6917 error ("both %<signed%> and %<void%> in "
6918 "declaration specifiers");
6919 else if (specs->unsigned_p)
6920 error ("both %<unsigned%> and %<void%> in "
6921 "declaration specifiers");
6922 else if (specs->complex_p)
6923 error ("both %<complex%> and %<void%> in "
6924 "declaration specifiers");
6926 specs->typespec_word = cts_void;
6930 error ("both %<long%> and %<_Bool%> in "
6931 "declaration specifiers");
6932 else if (specs->short_p)
6933 error ("both %<short%> and %<_Bool%> in "
6934 "declaration specifiers");
6935 else if (specs->signed_p)
6936 error ("both %<signed%> and %<_Bool%> in "
6937 "declaration specifiers");
6938 else if (specs->unsigned_p)
6939 error ("both %<unsigned%> and %<_Bool%> in "
6940 "declaration specifiers");
6941 else if (specs->complex_p)
6942 error ("both %<complex%> and %<_Bool%> in "
6943 "declaration specifiers");
6945 specs->typespec_word = cts_bool;
6949 error ("both %<long%> and %<char%> in "
6950 "declaration specifiers");
6951 else if (specs->short_p)
6952 error ("both %<short%> and %<char%> in "
6953 "declaration specifiers");
6955 specs->typespec_word = cts_char;
6958 specs->typespec_word = cts_int;
6962 error ("both %<long%> and %<float%> in "
6963 "declaration specifiers");
6964 else if (specs->short_p)
6965 error ("both %<short%> and %<float%> in "
6966 "declaration specifiers");
6967 else if (specs->signed_p)
6968 error ("both %<signed%> and %<float%> in "
6969 "declaration specifiers");
6970 else if (specs->unsigned_p)
6971 error ("both %<unsigned%> and %<float%> in "
6972 "declaration specifiers");
6974 specs->typespec_word = cts_float;
6977 if (specs->long_long_p)
6978 error ("both %<long long%> and %<double%> in "
6979 "declaration specifiers");
6980 else if (specs->short_p)
6981 error ("both %<short%> and %<double%> in "
6982 "declaration specifiers");
6983 else if (specs->signed_p)
6984 error ("both %<signed%> and %<double%> in "
6985 "declaration specifiers");
6986 else if (specs->unsigned_p)
6987 error ("both %<unsigned%> and %<double%> in "
6988 "declaration specifiers");
6990 specs->typespec_word = cts_double;
6993 /* ObjC reserved word "id", handled below. */
6999 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
7000 form of ObjC type, cases such as "int" and "long" being handled
7001 above), a TYPE (struct, union, enum and typeof specifiers) or an
7002 ERROR_MARK. In none of these cases may there have previously
7003 been any type specifiers. */
7004 if (specs->type || specs->typespec_word != cts_none
7005 || specs->long_p || specs->short_p || specs->signed_p
7006 || specs->unsigned_p || specs->complex_p)
7007 error ("two or more data types in declaration specifiers");
7008 else if (TREE_CODE (type) == TYPE_DECL)
7010 if (TREE_TYPE (type) == error_mark_node)
7011 ; /* Allow the type to default to int to avoid cascading errors. */
7014 specs->type = TREE_TYPE (type);
7015 specs->decl_attr = DECL_ATTRIBUTES (type);
7016 specs->typedef_p = true;
7017 specs->explicit_signed_p = C_TYPEDEF_EXPLICITLY_SIGNED (type);
7020 else if (TREE_CODE (type) == IDENTIFIER_NODE)
7022 tree t = lookup_name (type);
7023 if (!t || TREE_CODE (t) != TYPE_DECL)
7024 error ("%qs fails to be a typedef or built in type",
7025 IDENTIFIER_POINTER (type));
7026 else if (TREE_TYPE (t) == error_mark_node)
7029 specs->type = TREE_TYPE (t);
7031 else if (TREE_CODE (type) != ERROR_MARK)
7033 if (spec.kind == ctsk_tagdef || spec.kind == ctsk_tagfirstref)
7034 specs->tag_defined_p = true;
7035 if (spec.kind == ctsk_typeof)
7036 specs->typedef_p = true;
7043 /* Add the storage class specifier or function specifier SCSPEC to the
7044 declaration specifiers SPECS, returning SPECS. */
7046 struct c_declspecs *
7047 declspecs_add_scspec (struct c_declspecs *specs, tree scspec)
7050 enum c_storage_class n = csc_none;
7052 gcc_assert (TREE_CODE (scspec) == IDENTIFIER_NODE
7053 && C_IS_RESERVED_WORD (scspec));
7054 i = C_RID_CODE (scspec);
7055 if (extra_warnings && specs->non_sc_seen_p)
7056 warning ("%qs is not at beginning of declaration",
7057 IDENTIFIER_POINTER (scspec));
7061 /* C99 permits duplicate inline. Although of doubtful utility,
7062 it seems simplest to permit it in gnu89 mode as well, as
7063 there is also little utility in maintaining this as a
7064 difference between gnu89 and C99 inline. */
7066 specs->inline_p = true;
7069 dupe = specs->thread_p;
7070 if (specs->storage_class == csc_auto)
7071 error ("%<__thread%> used with %<auto%>");
7072 else if (specs->storage_class == csc_register)
7073 error ("%<__thread%> used with %<register%>");
7074 else if (specs->storage_class == csc_typedef)
7075 error ("%<__thread%> used with %<typedef%>");
7077 specs->thread_p = true;
7084 /* Diagnose "__thread extern". */
7085 if (specs->thread_p)
7086 error ("%<__thread%> before %<extern%>");
7093 /* Diagnose "__thread static". */
7094 if (specs->thread_p)
7095 error ("%<__thread%> before %<static%>");
7103 if (n != csc_none && n == specs->storage_class)
7106 error ("duplicate %qs", IDENTIFIER_POINTER (scspec));
7109 if (specs->storage_class != csc_none && n != specs->storage_class)
7111 error ("multiple storage classes in declaration specifiers");
7115 specs->storage_class = n;
7116 if (n != csc_extern && n != csc_static && specs->thread_p)
7118 error ("%<__thread%> used with %qs",
7119 IDENTIFIER_POINTER (scspec));
7120 specs->thread_p = false;
7127 /* Add the attributes ATTRS to the declaration specifiers SPECS,
7130 struct c_declspecs *
7131 declspecs_add_attrs (struct c_declspecs *specs, tree attrs)
7133 specs->attrs = chainon (attrs, specs->attrs);
7137 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
7138 specifiers with any other type specifier to determine the resulting
7139 type. This is where ISO C checks on complex types are made, since
7140 "_Complex long" is a prefix of the valid ISO C type "_Complex long
7143 struct c_declspecs *
7144 finish_declspecs (struct c_declspecs *specs)
7146 /* If a type was specified as a whole, we have no modifiers and are
7148 if (specs->type != NULL_TREE)
7150 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
7151 && !specs->signed_p && !specs->unsigned_p
7152 && !specs->complex_p);
7156 /* If none of "void", "_Bool", "char", "int", "float" or "double"
7157 has been specified, treat it as "int" unless "_Complex" is
7158 present and there are no other specifiers. If we just have
7159 "_Complex", it is equivalent to "_Complex double", but e.g.
7160 "_Complex short" is equivalent to "_Complex short int". */
7161 if (specs->typespec_word == cts_none)
7163 if (specs->long_p || specs->short_p
7164 || specs->signed_p || specs->unsigned_p)
7166 specs->typespec_word = cts_int;
7168 else if (specs->complex_p)
7170 specs->typespec_word = cts_double;
7172 pedwarn ("ISO C does not support plain %<complex%> meaning "
7173 "%<double complex%>");
7177 specs->typespec_word = cts_int;
7178 specs->default_int_p = true;
7179 /* We don't diagnose this here because grokdeclarator will
7180 give more specific diagnostics according to whether it is
7181 a function definition. */
7185 /* If "signed" was specified, record this to distinguish "int" and
7186 "signed int" in the case of a bit-field with
7187 -funsigned-bitfields. */
7188 specs->explicit_signed_p = specs->signed_p;
7190 /* Now compute the actual type. */
7191 switch (specs->typespec_word)
7194 gcc_assert (!specs->long_p && !specs->short_p
7195 && !specs->signed_p && !specs->unsigned_p
7196 && !specs->complex_p);
7197 specs->type = void_type_node;
7200 gcc_assert (!specs->long_p && !specs->short_p
7201 && !specs->signed_p && !specs->unsigned_p
7202 && !specs->complex_p);
7203 specs->type = boolean_type_node;
7206 gcc_assert (!specs->long_p && !specs->short_p);
7207 gcc_assert (!(specs->signed_p && specs->unsigned_p));
7208 if (specs->signed_p)
7209 specs->type = signed_char_type_node;
7210 else if (specs->unsigned_p)
7211 specs->type = unsigned_char_type_node;
7213 specs->type = char_type_node;
7214 if (specs->complex_p)
7217 pedwarn ("ISO C does not support complex integer types");
7218 specs->type = build_complex_type (specs->type);
7222 gcc_assert (!(specs->long_p && specs->short_p));
7223 gcc_assert (!(specs->signed_p && specs->unsigned_p));
7224 if (specs->long_long_p)
7225 specs->type = (specs->unsigned_p
7226 ? long_long_unsigned_type_node
7227 : long_long_integer_type_node);
7228 else if (specs->long_p)
7229 specs->type = (specs->unsigned_p
7230 ? long_unsigned_type_node
7231 : long_integer_type_node);
7232 else if (specs->short_p)
7233 specs->type = (specs->unsigned_p
7234 ? short_unsigned_type_node
7235 : short_integer_type_node);
7237 specs->type = (specs->unsigned_p
7238 ? unsigned_type_node
7239 : integer_type_node);
7240 if (specs->complex_p)
7243 pedwarn ("ISO C does not support complex integer types");
7244 specs->type = build_complex_type (specs->type);
7248 gcc_assert (!specs->long_p && !specs->short_p
7249 && !specs->signed_p && !specs->unsigned_p);
7250 specs->type = (specs->complex_p
7251 ? complex_float_type_node
7255 gcc_assert (!specs->long_long_p && !specs->short_p
7256 && !specs->signed_p && !specs->unsigned_p);
7259 specs->type = (specs->complex_p
7260 ? complex_long_double_type_node
7261 : long_double_type_node);
7265 specs->type = (specs->complex_p
7266 ? complex_double_type_node
7267 : double_type_node);
7277 /* Synthesize a function which calls all the global ctors or global
7278 dtors in this file. This is only used for targets which do not
7279 support .ctors/.dtors sections. FIXME: Migrate into cgraph. */
7281 build_cdtor (int method_type, tree cdtors)
7288 for (; cdtors; cdtors = TREE_CHAIN (cdtors))
7289 append_to_statement_list (build_function_call (TREE_VALUE (cdtors), 0),
7292 cgraph_build_static_cdtor (method_type, body, DEFAULT_INIT_PRIORITY);
7295 /* Perform final processing on one file scope's declarations (or the
7296 external scope's declarations), GLOBALS. */
7298 c_write_global_declarations_1 (tree globals)
7300 size_t len = list_length (globals);
7301 tree *vec = XNEWVEC (tree, len);
7305 /* Process the decls in the order they were written. */
7306 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
7309 /* Check for used but undefined static functions using the C
7310 standard's definition of "used", and set TREE_NO_WARNING so
7311 that check_global_declarations doesn't repeat the check. */
7312 if (TREE_CODE (decl) == FUNCTION_DECL
7313 && DECL_INITIAL (decl) == 0
7314 && DECL_EXTERNAL (decl)
7315 && !TREE_PUBLIC (decl)
7316 && C_DECL_USED (decl))
7318 pedwarn ("%J%qF used but never defined", decl, decl);
7319 TREE_NO_WARNING (decl) = 1;
7323 wrapup_global_declarations (vec, len);
7324 check_global_declarations (vec, len);
7330 c_write_global_declarations (void)
7334 /* We don't want to do this if generating a PCH. */
7338 /* Don't waste time on further processing if -fsyntax-only or we've
7339 encountered errors. */
7340 if (flag_syntax_only || errorcount || sorrycount || cpp_errors (parse_in))
7343 /* Close the external scope. */
7344 ext_block = pop_scope ();
7346 gcc_assert (!current_scope);
7348 /* Process all file scopes in this compilation, and the external_scope,
7349 through wrapup_global_declarations and check_global_declarations. */
7350 for (t = all_translation_units; t; t = TREE_CHAIN (t))
7351 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t)));
7352 c_write_global_declarations_1 (BLOCK_VARS (ext_block));
7354 /* Generate functions to call static constructors and destructors
7355 for targets that do not support .ctors/.dtors sections. These
7356 functions have magic names which are detected by collect2. */
7357 build_cdtor ('I', static_ctors); static_ctors = 0;
7358 build_cdtor ('D', static_dtors); static_dtors = 0;
7360 /* We're done parsing; proceed to optimize and emit assembly.
7361 FIXME: shouldn't be the front end's responsibility to call this. */
7365 #include "gt-c-decl.h"